Import Dev86-0.0.4.tar.gzv0.0.4

12 files changed, 3228 insertions, 0 deletions

diff --git a/dis88/Makefile b/dis88/Makefile
new file mode 100644
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--- /dev/null
+++ b/dis88/Makefile
@@ -0,0 +1,51 @@
+# Makefile for dis
+
+# @(#) Makefile, Ver. 2.1 created 00:00:00 87/09/01
+# Makefile for 8088 symbolic disassembler
+
+# Copyright (C) 1987 G. M. Harding, all rights reserved.
+# Permission to copy and redistribute is hereby granted,
+# provided full source code, with all copyright notices,
+# accompanies any redistribution.
+
+# This Makefile  automates the process of compiling and linking
+# a symbolic  object-file  disassembler  program  for the Intel
+# 8088 CPU. Relatively machine-independent code is contained in
+# the file dismain.c; lookup tables and handler routines, which
+# are by their nature  machine-specific,  are  contained in two
+# files named distabs.c and dishand.c,  respectively.  (A third
+# machine-specific file, disfp.c, contains handler routines for
+# floating-point  coprocessor opcodes.)  A header file,  dis.h,
+# attempts to mediate between the machine-specific and machine-
+# independent portions of the code. An attempt has been made to
+# isolate machine  dependencies and to deal with them in fairly
+# straightforward ways. Thus, it should be possible to target a
+# different CPU by rewriting the handler  routines and changing
+# the initialization  data in the lookup tables.  It should not
+# be necessary to alter the formats of the tables.
+
+CC=bcc
+CFLAGS=-O
+LDFLAGS=
+
+OBJ = disrel.o dismain.o distabs.o dishand.o disfp.o
+
+all:	dis88
+
+dis88:	$(OBJ)
+	$(CC) $(LDFLAGS) -o dis88 $(OBJ)
+
+install:	/usr/bin/dis88
+
+/usr/bin/dis88:	dis88
+	install -cs -o bin dis88 $@
+
+disrel.o:	disrel.c
+dismain.o:	dismain.c dis.h
+distabs.o:	distabs.c dis.h
+dishand.o:	dishand.c dis.h
+disfp.o:	disfp.c dis.h
+
+
+clean:	
+	rm -f *.bak *.o core dis88
diff --git a/dis88/README b/dis88/README
new file mode 100644
index 0000000..efc5ad9
--- /dev/null
+++ b/dis88/README
@@ -0,0 +1,90 @@
+                                     dis88
+                                  Beta Release
+                                    87/09/01
+                                      ---
+                                 G. M. HARDING
+                                    POB 4142
+                           Santa Clara CA  95054-0142
+
+
+             "Dis88" is a symbolic disassembler for the Intel 8088 CPU,
+        designed to run under the PC/IX  operating  system on an IBM XT
+        or fully-compatible clone.  Its output is in the format of, and
+        is completely compatible with, the PC/IX assembler,  "as".  The
+        program is copyrighted by its author, but may be copied and re-
+        distributed freely provided that complete source code, with all
+        copyright notices, accompanies any distribution. This provision
+        also applies to any  modifications you may make.  You are urged
+        to comment such changes,  giving,  as a miminum,  your name and
+        complete address.
+
+             This release of the program is a beta release, which means
+        that it has been  extensively,  but not  exhaustively,  tested.
+        User comments, recommendations, and bug fixes are welcome.  The
+        principal features of the current release are:
+
+             (a)  The ability to  disassemble  any file in PC/IX object
+        format, making full use of symbol and relocation information if
+        it is present,  regardless of whether the file is executable or
+        linkable,  and regardless of whether it has continuous or split
+        I/D space;
+
+             (b)  Automatic generation of synthetic labels when no sym-
+        bol table is available; and
+
+             (c)  Optional  output of address and object-code  informa-
+        tion as assembler comment text.
+
+             Limitations of the current release are:
+
+             (a)  Numeric co-processor  (i.e., 8087)  mnemonics are not
+        supported.  Instructions  for the co-processor are disassembled
+        as CPU escape  sequences,  or as  interrupts,  depending on how
+        they were assembled in the first place. This limitation will be
+        addressed in a future release.
+
+             (b)  Symbolic  references  within the object  file's  data
+        segment are not supported. Thus, for example, if a data segment
+        location is initialized to point to a text segment address,  no
+        reference to a text segment symbol will be detected. This limi-
+        tation is likely to remain in future  releases,  because object
+        code does not, in most cases, contain sufficient information to
+        allow meaningful interpretation of pure data.  (Note,  however,
+        that  symbolic  references  to the data segment from within the
+        text segment are always supported.)
+
+             As a final caveat,  be aware that the PC/IX assembler does
+        not recognize the  "esc"  mnemonic,  even though it refers to a
+        completely  valid CPU operation  which is documented in all the
+        Intel literature. Thus, the corresponding opcodes (0xd8 through
+        0xdf) are disassembled as .byte directives. For reference, how-
+        ever,  the syntactically-correct "esc" instruction is output as
+        a comment.
+
+             To build the disassembler program, transfer all the source
+        files,  together with the Makefile,  to a suitable  (preferably
+        empty) PC/IX directory. Then, simply type "make".
+
+             To use dis88,  place it in a  directory  which  appears in
+        your $PATH list.  It may then be invoked by name from  whatever
+        directory you happen to be in.  As a minimum,  the program must
+        be invoked with one command-line argument:  the name of the ob-
+        ject file to be disassembled.  (Dis88 will complain if the file
+        specified is not an object file.)  Optionally,  you may specify
+        an output file; stdout is the default.  One command-line switch
+        is available:  "-o",  which makes the program display addresses
+        and object code along with its mnemonic disassembly.
+
+             The "-o" option is useful primarily for verifying the cor-
+        rectness of the program's output. In particular, it may be used
+        to check the accuracy of local  relative  jump  opcodes.  These
+        jumps often  target  local  labels,  which are lost at assembly
+        time;  thus,  the disassembly may contain cryptic  instructions
+        like "jnz .+39".  As a user convenience,  all relative jump and
+        call  opcodes are output with a comment  which  identifies  the
+        physical target address.
+
+             By convention, the release level of the program as a whole
+        is the SID of the file disrel.c, and this SID string appears in
+        each disassembly.  Release 2.1 of the program is the first beta
+        release to be distributed on Usenet.
diff --git a/dis88/a.out.h b/dis88/a.out.h
new file mode 120000
index 0000000..ccbf4b5
--- /dev/null
+++ b/dis88/a.out.h
@@ -0,0 +1 @@
+../libc/include/a.out.h
\ No newline at end of file
diff --git a/dis88/ansi.h b/dis88/ansi.h
new file mode 100644
index 0000000..825b4a6
--- /dev/null
+++ b/dis88/ansi.h
@@ -0,0 +1,58 @@
+/* The <ansi.h> header attempts to decide whether the compiler has enough
+ * conformance to Standard C for Minix to take advantage of.  If so, the
+ * symbol _ANSI is defined (as 31415).  Otherwise _ANSI is not defined
+ * here, but it may be defined by applications that want to bend the rules.
+ * The magic number in the definition is to inhibit unnecessary bending
+ * of the rules.  (For consistency with the new '#ifdef _ANSI" tests in
+ * the headers, _ANSI should really be defined as nothing, but that would
+ * break many library routines that use "#if _ANSI".)
+
+ * If _ANSI ends up being defined, a macro
+ *
+ *	_PROTOTYPE(function, params)
+ *
+ * is defined.  This macro expands in different ways, generating either
+ * ANSI Standard C prototypes or old-style K&R (Kernighan & Ritchie)
+ * prototypes, as needed.  Finally, some programs use _CONST, _VOIDSTAR etc
+ * in such a way that they are portable over both ANSI and K&R compilers.
+ * The appropriate macros are defined here.
+ */
+
+#ifndef _ANSI_H
+#define _ANSI_H
+
+#if __STDC__ == 1
+#define _ANSI		31459	/* compiler claims full ANSI conformance */
+#endif
+
+#ifdef __GNUC__
+#define _ANSI		31459	/* gcc conforms enough even in non-ANSI mode */
+#endif
+
+#ifdef _ANSI
+
+/* Keep everything for ANSI prototypes. */
+#define	_PROTOTYPE(function, params)	function params
+#define	_ARGS(params)			params
+
+#define	_VOIDSTAR	void *
+#define	_VOID		void
+#define	_CONST		const
+#define	_VOLATILE	volatile
+#define _SIZET		size_t
+
+#else
+
+/* Throw away the parameters for K&R prototypes. */
+#define	_PROTOTYPE(function, params)	function()
+#define	_ARGS(params)			()
+
+#define	_VOIDSTAR	void *
+#define	_VOID		void
+#define	_CONST
+#define	_VOLATILE
+#define _SIZET		int
+
+#endif /* _ANSI */
+
+#endif /* ANSI_H */
diff --git a/dis88/dis.h b/dis88/dis.h
new file mode 100644
index 0000000..7815e06
--- /dev/null
+++ b/dis88/dis.h
@@ -0,0 +1,170 @@
+ /*
+ ** @(#) dis.h, Ver. 2.1 created 00:00:00 87/09/01
+ */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  *  Copyright (C) 1987 G. M. Harding, all rights reserved  *
+  *                                                         *
+  * Permission to copy and  redistribute is hereby granted, *
+  * provided full source code,  with all copyright notices, *
+  * accompanies any redistribution.                         *
+  *                                                         *
+  * This file contains declarations and definitions used by *
+  * the 8088 disassembler program. The program was designed *
+  * for execution on a machine of its own type (i.e., it is *
+  * not designed as a cross-disassembler);  consequently, A *
+  * SIXTEEN-BIT INTEGER SIZE HAS BEEN ASSUMED. This assump- *
+  * tion is not particularly important,  however, except in *
+  * the machine-specific  portions of the code  (i.e.,  the *
+  * handler  routines and the optab[] array).  It should be *
+  * possible to override this assumption,  for execution on *
+  * 32-bit machines,  by use of a  pre-processor  directive *
+  * (see below); however, this has not been tested.         *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include <sys/types.h>
+#include <fcntl.h>      /* System file-control definitions  */
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>      /* System standard I/O definitions  */
+#include "a.out.h"      /* Object file format definitions   */
+#include "ansi.h"
+
+#define MAXSYM  800     /* Maximum entries in symbol table  */
+
+extern struct nlist     /* Array to hold the symbol table   */
+   symtab[MAXSYM];
+
+extern struct reloc     /* Array to hold relocation table   */
+   relo[MAXSYM];
+
+extern int symptr;      /* Index into the symtab[] array    */
+extern int relptr;      /* Index into the relo[] array      */
+
+struct opcode           /* Format for opcode data records   */
+{
+   char *text;          /* Pointer to mnemonic text   */
+   void (*func)();      /* Pointer to handler routine */
+   unsigned min;        /* Minimum # of object bytes  */
+   unsigned max;        /* Maximum # of object bytes  */
+};
+
+extern struct opcode    /* Array to hold the opcode table   */
+  optab[256];
+
+extern char *REGS[];    /* Table of register names          */
+extern char *REGS0[];   /* Mode 0 register name table       */
+extern char *REGS1[];   /* Mode 1 register name table       */
+
+#define AL REGS[0]      /* CPU register manifests           */
+#define CL REGS[1]
+#define DL REGS[2]
+#define BL REGS[3]
+#define AH REGS[4]
+#define CH REGS[5]
+#define DH REGS[6]
+#define BH REGS[7]
+#define AX REGS[8]
+#define CX REGS[9]
+#define DX REGS[10]
+#define BX REGS[11]
+#define SP REGS[12]
+#define BP REGS[13]
+#define SI REGS[14]
+#define DI REGS[15]
+#define ES REGS[16]
+#define CS REGS[17]
+#define SS REGS[18]
+#define DS REGS[19]
+#define BX_SI REGS0[0]
+#define BX_DI REGS0[1]
+#define BP_SI REGS0[2]
+#define BP_DI REGS0[3]
+
+extern int symrank[6][6];     /* Symbol type/rank matrix    */
+extern unsigned long PC;      /* Current program counter    */
+extern int segflg;      /* Flag: segment override in effect */
+extern int objflg;      /* Flag: output object as a comment */
+
+#define OBJMAX 8        /* Size of the object code buffer   */
+
+extern unsigned char    /* Internal buffer for object code  */
+   objbuf[OBJMAX];
+
+extern int objptr;      /* Index into the objbuf[] array    */
+
+extern char ADD[],      /* Opcode family mnemonic strings   */
+            OR[],
+            ADC[],
+            SBB[],
+            AND[],
+            SUB[],
+            XOR[],
+            CMP[],
+            NOT[],
+            NEG[],
+            MUL[],
+            DIV[],
+            MOV[],
+            ESC[],
+            TEST[],
+            AMBIG[];
+
+extern char *OPFAM[];   /* Indexed mnemonic family table    */
+extern struct exec HDR; /* Holds the object file's header   */
+
+#define LOOK_ABS 0      /* Arguments to lookup() function   */
+#define LOOK_REL 1
+#define LOOK_LNG 2
+
+#define TR_STD 0        /* Arguments to mtrans() function   */
+#define TR_SEG 8
+
+                        /* Macro for byte input primitive   */
+/* #define FETCH(p)  ++PC; p = getchar() & 0xff; objbuf[objptr++] = p */
+static int _F_;
+#define FETCH(p)  (p)=_F_ = Fetch(); if(_F_<0) {printf("???\n"); return; }
+
+
+/* disfp.c */
+_PROTOTYPE(void eshand, (int j ));
+_PROTOTYPE(void fphand, (int j ));
+_PROTOTYPE(void inhand, (int j ));
+
+/* dishand.c */
+_PROTOTYPE(void objini, (int j ));
+_PROTOTYPE(void objout, (void));
+_PROTOTYPE(void badseq, (int j, int k ));
+_PROTOTYPE(void dfhand, (int j ));
+_PROTOTYPE(void sbhand, (int j ));
+_PROTOTYPE(void aohand, (int j ));
+_PROTOTYPE(void sjhand, (int j ));
+_PROTOTYPE(void imhand, (int j ));
+_PROTOTYPE(void mvhand, (int j ));
+_PROTOTYPE(void mshand, (int j ));
+_PROTOTYPE(void pohand, (int j ));
+_PROTOTYPE(void cihand, (int j ));
+_PROTOTYPE(void mihand, (int j ));
+_PROTOTYPE(void mqhand, (int j ));
+_PROTOTYPE(void tqhand, (int j ));
+_PROTOTYPE(void rehand, (int j ));
+_PROTOTYPE(void mmhand, (int j ));
+_PROTOTYPE(void srhand, (int j ));
+_PROTOTYPE(void aahand, (int j ));
+_PROTOTYPE(void iohand, (int j ));
+_PROTOTYPE(void ljhand, (int j ));
+_PROTOTYPE(void mahand, (int j ));
+_PROTOTYPE(void mjhand, (int j ));
+
+/* dismain.c */
+_PROTOTYPE(void main, (int argc, char **argv ));
+
+/* distabs.c */
+_PROTOTYPE(char *getnam, (int k ));
+_PROTOTYPE(int lookext, (long off, long loc, char *buf ));
+_PROTOTYPE(char *lookup, (long addr, int type, int kind, long ext ));
+_PROTOTYPE(char *mtrans, (int c, int m, int type ));
+_PROTOTYPE(void mtrunc, (char *a ));
diff --git a/dis88/dis88.1 b/dis88/dis88.1
new file mode 100644
index 0000000..c991ad7
--- /dev/null
+++ b/dis88/dis88.1
@@ -0,0 +1,147 @@
+.TH dis88 1 LOCAL
+.SH "NAME"
+dis88 \- 8088 symbolic disassembler
+.SH "SYNOPSIS"
+\fBdis88\fP [ -o ] ifile [ ofile ]
+.SH "DESCRIPTION"
+Dis88 reads ifile, which must be in PC/IX a.out format.
+It interprets the binary opcodes and data locations, and
+writes corresponding assembler source code to stdout, or
+to ofile if specified.  The program's output is in the
+format of, and fully compatible with, the PC/IX assembler,
+as(1).  If a symbol table is present in ifile, labels and
+references will be symbolic in the output.  If the input
+file lacks a symbol table, the fact will be noted, and the
+disassembly will proceed, with the disassembler generating
+synthetic labels as needed.  If the input file has split
+I/D space, or if it is executable, the disassembler will
+make all necessary adjustments in address-reference calculations.
+.PP
+If the "-o" option appears, object code will be included
+in comments during disassembly of the text segment.  This
+feature is used primarily for debugging the disassembler
+itself, but may provide information of passing interest
+to users.
+.PP
+The program always outputs the current machine address
+before disassembling an opcode.  If a symbol table is
+present, this address is output as an assembler comment;
+otherwise, it is incorporated into the synthetic label
+which is generated internally.  Since relative jumps,
+especially short ones, may target unlabelled locations,
+the program always outputs the physical target address
+as a comment, to assist the user in following the code.
+.PP
+The text segment of an object file is always padded to
+an even machine address.  In addition, if the file has
+split I/D space, the text segment will be padded to a
+paragraph boundary (i.e., an address divisible by 16).
+As a result of this padding, the disassembler may produce
+a few spurious, but harmless, instructions at the
+end of the text segment.
+.PP
+Disassembly of the data segment is a difficult matter.
+The information to which initialized data refers cannot
+be inferred from context, except in the special case
+of an external data or address reference, which will be
+reflected in the relocation table.  Internal data and
+address references will already be resolved in the object file,
+and cannot be recreated.  Therefore, the data
+segment is disassembled as a byte stream, with long
+stretches of null data represented by an appropriate
+".zerow" pseudo-op.  This limitation notwithstanding,
+labels (as opposed to symbolic references) are always
+output at appropriate points within the data segment.
+.PP
+If disassembly of the data segment is difficult, disassembly of the
+bss segment is quite easy, because uninitialized data is all
+zero by definition.  No data
+is output in the bss segment, but symbolic labels are
+output as appropriate.
+.PP
+For each opcode which takes an operand, a particular
+symbol type (text, data, or bss) is appropriate.  This
+tidy correspondence is complicated somewhat, however,
+by the existence of assembler symbolic constants and
+segment override opcodes.  Therefore, the disassembler's
+symbol lookup routine attempts to apply a certain amount
+of intelligence when it is asked to find a symbol.  If
+it cannot match on a symbol of the preferred type, it
+may return a symbol of some other type, depending on
+preassigned (and somewhat arbitrary) rankings within
+each type.  Finally, if all else fails, it returns a
+string containing the address sought as a hex constant;
+this behavior allows calling routines to use the output
+of the lookup function regardless of the success of its
+search.
+.PP
+It is worth noting, at this point, that the symbol lookup
+routine operates linearly, and has not been optimized in
+any way.  Execution time is thus likely to increase
+geometrically with input file size.  The disassembler is
+internally limited to 1500 symbol table entries and 1500
+relocation table entries; while these limits are generous
+(/unix, itself, has fewer than 800 symbols), they are not
+guaranteed to be adequate in all cases.  If the symbol
+table or the relocation table overflows, the disassembly
+aborts.
+.PP
+Finally, users should be aware of a bug in the assembler,
+which causes it not to parse the "esc" mnemonic, even
+though "esc" is a completely legitimate opcode which is
+documented in all the Intel literature.  To accommodate
+this deficiency, the disassembler translates opcodes of
+the "esc" family to .byte directives, but notes the
+correct mnemonic in a comment for reference.
+.PP
+In all cases, it should be possible to submit the output
+of the disassembler program to the assembler, and assemble
+it without error.  In most cases, the resulting object
+code will be identical to the original; in any event, it
+will be functionally equivalent.
+.SH "SEE ALSO"
+adb(1), as(1), cc(1), ld(1).
+.br
+"Assembler Reference Manual" in the PC/IX Programmer's
+Guide.
+.SH "DIAGNOSTICS"
+"can't access input file" if the input file cannot be
+found, opened, or read.
+.sp
+"can't open output file" if the output file cannot be
+created.
+.sp
+"warning: host/cpu clash" if the program is run on a
+machine with a different CPU.
+.sp
+"input file not in object format" if the magic number
+does not correspond to that of a PC/IX object file.
+.sp
+"not an 8086/8088 object file" if the CPU ID of the
+file header is incorrect.
+.sp
+"reloc table overflow" if there are more than 1500
+entries in the relocation table.
+.sp
+"symbol table overflow" if there are more than 1500
+entries in the symbol table.
+.sp
+"lseek error" if the input file is corrupted (should
+never happen).
+.sp
+"warning: no symbols" if the symbol table is missing.
+.sp
+"can't reopen input file" if the input file is removed
+or altered during program execution (should never happen).
+.SH "BUGS"
+Numeric co-processor (i.e., 8087) mnemonics are not currently supported.
+Instructions for the co-processor are
+disassembled as CPU escape sequences, or as interrupts,
+depending on how they were assembled in the first place.
+.sp
+Despite the program's best efforts, a symbol retrieved
+from the symbol table may sometimes be different from
+the symbol used in the original assembly.
+.sp
+The disassembler's internal tables are of fixed size,
+and the program aborts if they overflow.
diff --git a/dis88/disfp.c b/dis88/disfp.c
new file mode 100644
index 0000000..c6dc0da
--- /dev/null
+++ b/dis88/disfp.c
@@ -0,0 +1,157 @@
+static char *sccsid =
+   "@(#) disfp.c, Ver. 2.1 created 00:00:00 87/09/01";
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  *  Copyright (C) 1987 G. M. Harding, all rights reserved  *
+  *                                                         *
+  * Permission to copy and  redistribute is hereby granted, *
+  * provided full source code,  with all copyright notices, *
+  * accompanies any redistribution.                         *
+  *                                                         *
+  * This file contains handler routines for the numeric op- *
+  * codes of the 8087 co-processor,  as well as a few other *
+  * opcodes which are related to 8087 emulation.            *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include "dis.h"              /* Disassembler declarations  */
+
+#define FPINT0 0xd8           /* Floating-point interrupts  */
+#define FPINT1 0xd9
+#define FPINT2 0xda
+#define FPINT3 0xdb
+#define FPINT4 0xdc
+#define FPINT5 0xdd
+#define FPINT6 0xde
+#define FPINT7 0xdf
+
+                              /* Test for floating opcodes  */
+#define ISFLOP(x) \
+   (((x) >= FPINT0) && ((x) <= FPINT7))
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the  handler for the escape  family of opcodes. *
+  * These opcodes place the contents of a specified  memory *
+  * location on the system bus,  for access by a peripheral *
+  * or by a co-processor such as the 8087. (The 8087 NDP is *
+  * accessed  only  via bus  escapes.)  Due to a bug in the *
+  * PC/IX assembler,  the "esc" mnemonic is not recognized; *
+  * consequently,  escape opcodes are disassembled as .byte *
+  * directives,  with the appropriate  mnemonic and operand *
+  * included as a comment.  FOR NOW, those escape sequences *
+  * corresponding  to 8087  opcodes  are  treated as simple *
+  * escapes.                                                *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+eshand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF eshand()  * * * * * * * * * */
+
+   register char *a;
+   register int k;
+
+   objini(j);
+
+   FETCH(k);
+
+   a = mtrans((j & 0xfd),(k & 0xc7),TR_STD);
+
+   mtrunc(a);
+
+   printf("\t.byte\t0x%02.2x\t\t| esc\t%s\n",j,a);
+
+   for (k = 1; k < objptr; ++k)
+      printf("\t.byte\t0x%02.2x\n",objbuf[k]);
+
+}/* * * * * * * * * * * END OF eshand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler routine for floating-point opcodes. *
+  * Since PC/IX must  accommodate  systems with and without *
+  * 8087 co-processors, it allows floating-point operations *
+  * to be  initiated  in either of two ways:  by a software *
+  * interrput whose type is in the range 0xd8 through 0xdf, *
+  * or by a CPU escape sequence, which is invoked by an op- *
+  * code in the same range.  In either case, the subsequent *
+  * byte determines the actual numeric operation to be per- *
+  * formed.  However,  depending  on the  method of access, *
+  * either  one or two code bytes will  precede  that byte, *
+  * and the fphand()  routine has no way of knowing whether *
+  * it was invoked by  interrupt or by an escape  sequence. *
+  * Therefore, unlike all of the other handler routines ex- *
+  * cept dfhand(),  fphand() does not initialize the object *
+  * buffer, leaving that chore to the caller.               *
+  *                                                         *
+  * FOR NOW,  fphand()  does not disassemble floating-point *
+  * opcodes to floating  mnemonics,  but simply outputs the *
+  * object code as .byte directives.                        *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+fphand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF fphand()  * * * * * * * * * */
+
+   register int k;
+
+   segflg = 0;
+
+   FETCH(k);
+
+   printf("\t.byte\t0x%02.2x\t\t| 8087 code sequence\n",
+    objbuf[0]);
+
+   for (k = 1; k < objptr; ++k)
+      printf("\t.byte\t0x%02.2x\n",objbuf[k]);
+
+/* objout();                                       FOR NOW  */
+
+}/* * * * * * * * * * * END OF fphand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the  handler for  variable  software  interrupt *
+  * opcodes.  It is included in this file because PC/IX im- *
+  * plements its software floating-point emulation by means *
+  * of interrupts.  Any interrupt in the range 0xd8 through *
+  * 0xdf is an  NDP-emulation  interrupt,  and is specially *
+  * handled by the assembler.                               *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+inhand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF inhand()  * * * * * * * * * */
+
+   register int k;
+
+   objini(j);
+
+   FETCH(k);
+
+   if (ISFLOP(k))
+      {
+      fphand(k);
+      return;
+      }
+
+   printf("%s\t%d\n",optab[j].text,k);
+
+   objout();
+
+}/* * * * * * * * * * * END OF inhand() * * * * * * * * * * */
+
+
diff --git a/dis88/dishand.c b/dis88/dishand.c
new file mode 100644
index 0000000..5983972
--- /dev/null
+++ b/dis88/dishand.c
@@ -0,0 +1,1049 @@
+static char *sccsid =
+   "@(#) dishand.c, Ver. 2.1 created 00:00:00 87/09/01";
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  *  Copyright (C) 1987 G. M. Harding, all rights reserved  *
+  *                                                         *
+  * Permission to copy and  redistribute is hereby granted, *
+  * provided full source code,  with all copyright notices, *
+  * accompanies any redistribution.                         *
+  *                                                         *
+  * This file contains the source code for most of the spe- *
+  * cialized handler routines of the disassembler  program. *
+  * (The file disfp.c contains handler routines specific to *
+  * the 8087 numeric  co-processor.)  Each handler  routine *
+  * interprets the opcode byte  (and subsequent data bytes, *
+  * if any)  of a particular family of opcodes,  and is re- *
+  * sponsible for generating appropriate output. All of the *
+  * code in this file is highly MACHINE-SPECIFIC, and would *
+  * have to be rewritten for a different  CPU.  The handler *
+  * routines are accessed  only via pointers in the optab[] *
+  * array, however, so machine dependencies are confined to *
+  * this file, its sister file "disfp.c", and the data file *
+  * "distabs.c".                                            *
+  *                                                         *
+  * All of the code in this file is based on the assumption *
+  * of sixteen-bit integers.                                *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include "dis.h"              /* Disassembler declarations  */
+
+int segflg;                   /* Segment-override flag      */
+
+unsigned char objbuf[OBJMAX]; /* Buffer for object code     */
+
+int objptr;                   /* Index into objbuf[]        */
+
+unsigned long PC;             /* Current program counter    */
+
+ /* * * * * *  MISCELLANEOUS SUPPORTING ROUTINES  * * * * * */
+
+
+void
+objini(j)                     /* Object code init routine   */
+
+   register int j;
+
+{
+   if ((segflg == 1) || (segflg == 2))
+      segflg *= 3;
+   else
+      segflg = 0;
+   objptr = 0;
+   objbuf[objptr++] = (unsigned char)(j);
+}
+
+
+void
+objout()                      /* Object-code output routine */
+
+{
+    register int k;
+
+   if ( ! objflg )
+      return;
+   else
+      {
+      printf("\t|");
+      if (symptr >= 0)
+         printf(" %05.5lx:",(PC + 1L - (long)(objptr)));
+      for (k = 0; k < objptr; ++k)
+         printf(" %02.2x",objbuf[k]);
+      putchar('\n');
+      }
+}
+
+
+void
+badseq(j,k)                   /* Invalid-sequence routine   */
+
+   register int j, k;
+
+{
+   printf("\t.byte\t0x%02.2x\t\t| invalid code sequence\n",j);
+   printf("\t.byte\t0x%02.2x\n",k);
+}
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This  routine  is the first of several  opcode-specific *
+  * handlers,  each of which is  dedicated  to a particular *
+  * opcode family.  A pointer to a handler  routine is con- *
+  * tained in the second field of each optab[]  entry.  The *
+  * dfhand()  routine is the default handler,  invoked when *
+  * no other handler is appropriate (generally, when an in- *
+  * valid opcode is encountered).                           *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+dfhand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF dfhand()  * * * * * * * * * */
+
+   segflg = 0;
+
+   printf("\t.byte\t0x%02.2x",j);
+
+   if (optab[j].min || optab[j].max)
+      putchar('\n');
+   else
+      printf("\t\t| unimplemented opcode\n");
+
+}/* * * * * * * * * * * END OF dfhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the  single-byte  handler,  invoked  whenever a *
+  * one-byte opcode is encountered.                         *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+sbhand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF sbhand()  * * * * * * * * * */
+
+   objini(j);
+
+   if (j == 0x2e)                               /* seg cs   */
+      segflg = 1;
+
+   if ((j == 0x26)                              /* seg es   */
+    || (j == 0x36)                              /* seg ss   */
+    || (j == 0x3e))                             /* seg ds   */
+      segflg = 2;
+
+   printf("%s\n",optab[j].text);
+
+   objout();
+
+}/* * * * * * * * * * * END OF sbhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for most of the processor's regular *
+  * arithmetic operations.                                  *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+aohand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF aohand()  * * * * * * * * * */
+
+   register int k;
+   int m, n;
+   char b[80];
+
+   objini(j);
+
+   switch (j & 7)
+      {
+      case 0 :
+      case 1 :
+      case 2 :
+      case 3 :
+         printf("%s\t",optab[j].text);
+         FETCH(k);
+         printf("%s\n",mtrans(j,k,TR_STD));
+         break;
+      case 4 :
+         FETCH(k);
+         printf("%s\tal,*0x%02.2x\n",optab[j].text,k);
+         break;
+      case 5 :
+         FETCH(m);
+         FETCH(n);
+         k = (n << 8) | m;
+         if (lookext((long)(k),(PC - 1),b))
+            printf("%s\tax,#%s\n",optab[j].text,b);
+         else
+            printf("%s\tax,#0x%04.4x\n",optab[j].text,k);
+         break;
+      default :
+         dfhand(j);
+         break;
+      }
+
+   objout();
+
+}/* * * * * * * * * * * END OF aohand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the  handler for opcodes  which  perform  short *
+  * (eight-bit) relative jumps.                             *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+sjhand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF sjhand()  * * * * * * * * * */
+
+   register int k;
+   int m;
+
+   objini(j);
+
+   FETCH(m);
+
+   if (m & 0x80)
+      k = 0xff00;
+   else
+      k = 0;
+
+   k |= m;
+
+   printf("%s\t%s\t\t| loc %05.5lx\n",optab[j].text,
+    lookup((PC + k + 1L),N_TEXT,LOOK_REL,-1L),
+    (PC + k + 1L));
+
+   objout();
+
+}/* * * * * * * * * * * END OF sjhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the  handler for a  loosely-knit  family of op- *
+  * codes which perform  arithmetic and logical operations, *
+  * and which take immediate  data.  The routine's logic is *
+  * rather complex,  so,  in an effort to avoid  additional *
+  * complexity,  the search for external  references in the *
+  * relocation table has been dispensed with. Eager hackers *
+  * can try their hand at coding such a search.             *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+imhand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF imhand()  * * * * * * * * * */
+
+   unsigned long pc;
+   register int k;
+   int offset, oflag, immed, iflag, mod, opi, w, rm;
+   int m, n;
+   static char a[100], b[30];
+
+   objini(j);
+
+   FETCH(k);
+
+   pc = PC + 1;
+
+   offset = 0;
+   mod = (k & 0xc0) >> 6;
+   opi = (k & 0x38) >> 3;
+   w = j & 1;
+   rm = k & 7;
+
+   if ((j & 2)
+    && ((opi == 1)
+     || (opi == 4)
+     || (opi == 6)))
+      {
+      badseq(j,k);
+      return;
+      }
+
+   strcpy(a,OPFAM[opi]);
+
+   if ( ! w )
+      strcat(a,"b");
+
+   if ((oflag = mod) > 2)
+      oflag = 0;
+
+   if ((mod == 0) && (rm == 6))
+      {
+      FETCH(m);
+      FETCH(n);
+      offset = (n << 8) | m;
+      }
+   else if (oflag)
+      if (oflag == 2)
+         {
+         FETCH(m);
+         FETCH(n);
+         offset = (n << 8) | m;
+         }
+      else
+         {
+         FETCH(m);
+         if (m & 0x80)
+            n = 0xff00;
+         else
+            n = 0;
+         offset = n | m;
+         }
+
+   switch (j & 3)
+      {
+      case 0 :
+      case 2 :
+         FETCH(immed);
+         iflag = 0;
+         break;
+      case 1 :
+         FETCH(m);
+         FETCH(n);
+         immed = (n << 8) | m;
+         iflag = 1;
+         break;
+      case 3 :
+         FETCH(immed);
+         if (immed & 0x80)
+            immed &= 0xff00;
+         iflag = 0;
+         break;
+      }
+
+   strcat(a,"\t");
+
+   switch (mod)
+      {
+      case 0 :
+         if (rm == 6)
+            strcat(a,
+             lookup((long)(offset),N_DATA,LOOK_ABS,pc));
+         else
+            {
+            sprintf(b,"(%s)",REGS0[rm]);
+            strcat(a,b);
+            }
+         break;
+      case 1 :
+      case 2 :
+         if (mod == 1)
+            strcat(a,"*");
+         else
+            strcat(a,"#");
+         sprintf(b,"%d(",offset);
+         strcat(a,b);
+         strcat(a,REGS1[rm]);
+         strcat(a,")");
+         break;
+      case 3 :
+         strcat(a,REGS[(w << 3) | rm]);
+         break;
+      }
+
+   strcat(a,",");
+   if (iflag)
+      strcat(a,"#");
+   else
+      strcat(a,"*");
+   sprintf(b,"%d",immed);
+   strcat(a,b);
+
+   printf("%s\n",a);
+
+   objout();
+
+}/* * * * * * * * * * * END OF imhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the  handler  for  various  "mov"-type  opcodes *
+  * which use the mod,  reg,  and r/m  fields of the second *
+  * code byte in a standard, straightforward way.           *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+mvhand(j)
+
+   int j;                     /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF mvhand()  * * * * * * * * * */
+
+   register int k, m = j;
+
+   objini(j);
+
+   FETCH(k);
+
+   if ((m == 0x84) || (m == 0x85)      /* Kind of kludgey   */
+    || (m == 0xc4) || (m == 0xc5)
+    || (m == 0x8d))
+      if (m & 0x40)
+         m |= 0x03;
+      else
+         m |= 0x02;
+
+   printf("%s\t%s\n",optab[j].text,mtrans(m,k,TR_STD));
+
+   objout();
+
+}/* * * * * * * * * * * END OF mvhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for segment-register "mov" opcodes. *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+mshand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF mshand()  * * * * * * * * * */
+
+   register int k;
+
+   objini(j);
+
+   FETCH(k);
+
+   if (k & 0x20)
+      {
+      badseq(j,k);
+      return;
+      }
+
+   printf("%s\t%s\n",optab[j].text,mtrans(j,k,TR_SEG));
+
+   objout();
+
+}/* * * * * * * * * * * END OF mshand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the  handler for pops,  other than  single-byte *
+  * pops.  (The 8088 allows  popping into any register,  or *
+  * directly into memory,  accessed  either  immediately or *
+  * through a register and an index.)                       *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+pohand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF pohand()  * * * * * * * * * */
+
+   char *a;
+   register int k;
+
+   objini(j);
+
+   FETCH(k);
+
+   if (k & 0x38)
+      {
+      badseq(j,k);
+      return;
+      }
+
+   printf("%s\t",optab[j].text);
+
+   a = mtrans((j & 0xfd),k,TR_STD);
+
+   mtrunc(a);
+
+   printf("%s\n",a);
+
+   objout();
+
+}/* * * * * * * * * * * END OF pohand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler routine for intersegment  calls and *
+  * jumps.  Its output is never symbolic,  because the host *
+  * linker  does not allow  symbolic  intersegment  address *
+  * references except by means of symbolic  constants,  and *
+  * any such  constants in the symbol  table,  even if they *
+  * are of the  appropriate  value,  may be misleading.  In *
+  * compiled code,  intersegment  references  should not be *
+  * encountered,  and even in assembled  code,  they should *
+  * occur infrequently. If and when they do occur, however, *
+  * they will be disassembled in absolute form.             *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+cihand(j)
+
+   int j;                     /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF cihand()  * * * * * * * * * */
+
+   register int m, n;
+
+   objini(j);
+
+   printf("%s\t",optab[j].text);
+
+   FETCH(m);
+   FETCH(n);
+
+   printf("#0x%04.4x,",((n << 8) | m));
+
+   FETCH(m);
+   FETCH(n);
+
+   printf("#0x%04.4x\n",((n << 8) | m));
+
+   objout();
+
+}/* * * * * * * * * * * END OF cihand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for  "mov"  opcodes with  immediate *
+  * data.                                                   *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+mihand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF mihand()  * * * * * * * * * */
+
+   register int k;
+   int m, n;
+   char b[80];
+
+   objini(j);
+
+   printf("%s",optab[j].text);
+
+   if (j & 8)
+      {
+      FETCH(m);
+      FETCH(n);
+      k = ((n << 8) | m);
+      if (lookext((long)(k),(PC - 1),b))
+         printf("#%s\n",b);
+      else
+         printf("#%d\n",k);
+      }
+   else
+      {
+      FETCH(m);
+      printf("*%d\n",m);
+      }
+
+   objout();
+
+}/* * * * * * * * * * * END OF mihand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for a family of quick-move opcodes. *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+mqhand(j)
+
+   int j;                     /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF mqhand()  * * * * * * * * * */
+
+   unsigned long pc;
+   register int m, n;
+
+   objini(j);
+
+   pc = PC + 1;
+
+   FETCH(m);
+   FETCH(n);
+
+   m = (n << 8) | m;
+
+   printf("%s\t",optab[j].text);
+
+   if (j & 2)
+      printf("%s,%s\n",
+       lookup((long)(m),N_DATA,LOOK_ABS,pc),
+       REGS[(j & 1) << 3]);
+   else
+      printf("%s,%s\n",
+       REGS[(j & 1) << 3],
+       lookup((long)(m),N_DATA,LOOK_ABS,pc));
+
+   objout();
+
+}/* * * * * * * * * * * END OF mqhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for a family of quick-test opcodes. *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+tqhand(j)
+
+   int j;                     /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF tqhand()  * * * * * * * * * */
+
+   register int m, n;
+   int k;
+   char b[80];
+
+   objini(j);
+
+   printf("%s\t%s,",optab[j].text,REGS[(j & 1) << 3]);
+
+   FETCH(m);
+
+   if (j & 1)
+      {
+      FETCH(n);
+      k = ((n << 8) | m);
+      if (lookext((long)(k),(PC - 1),b))
+         printf("#%s\n",b);
+      else
+         printf("#%d\n",k);
+      }
+   else
+      {
+      if (m & 80)
+         m |= 0xff00;
+      printf("*%d\n",m);
+      }
+
+   objout();
+
+}/* * * * * * * * * * * END OF tqhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for multiple-byte "return" opcodes. *
+  * The 8088 allows returns to take an optional  16-bit ar- *
+  * gument,  which  reflects  the  amount to be added to SP *
+  * after  the pop of the  return  address.  The idea is to *
+  * facilitate  the use of local  parameters  on the stack. *
+  * After some  rumination,  it was decided to  disassemble *
+  * any such arguments as absolute quantities,  rather than *
+  * rummaging  through the symbol table for possible corre- *
+  * sponding constants.                                     *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+rehand(j)
+
+   int j;                     /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF rehand()  * * * * * * * * * */
+
+   register int m, n;
+
+   objini(j);
+
+   FETCH(m);
+   FETCH(n);
+
+   m = (n << 8) | m;
+
+   printf("%s\t#0x%04.4x\n",optab[j].text,m);
+
+   objout();
+
+}/* * * * * * * * * * * END OF rehand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for "mov"  opcodes involving memory *
+  * and immediate data.                                     *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+mmhand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF mmhand()  * * * * * * * * * */
+
+   char *a;
+   register int k;
+   char b[80];
+
+   objini(j);
+
+   FETCH(k);
+
+   if (k & 0x38)
+      {
+      badseq(j,k);
+      return;
+      }
+
+   printf("%s",optab[j].text);
+
+   if ( ! (j & 1) )
+      putchar('b');
+
+   a = mtrans((j & 0xfd),(k & 0xc7),TR_STD);
+
+   mtrunc(a);
+
+   printf("\t%s,",a);
+
+   if (j & 1)
+      {
+      FETCH(j);
+      FETCH(k);
+      k = (k << 8) | j;
+      if (lookext((long)(k),(PC - 1),b))
+         printf("#%s\n",b);
+      else
+         printf("#%d\n",k);
+      }
+   else
+      {
+      FETCH(k);
+      printf("*%d\n",k);
+      }
+
+   objout();
+
+}/* * * * * * * * * * * END OF mmhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the  handler  for the 8088  family of shift and *
+  * rotate instructions.                                    *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+srhand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF srhand()  * * * * * * * * * */
+
+   char *a;
+   register int k;
+
+   objini(j);
+
+   FETCH(k);
+
+   if ((k & 0x38) == 0x30)
+      {
+      badseq(j,k);
+      return;
+      }
+
+   printf("%s",OPFAM[((k & 0x38) >> 3) + 16]);
+
+   if ( ! (j & 1) )
+      putchar('b');
+
+   a = mtrans((j & 0xfd),(k & 0xc7),TR_STD);
+
+   mtrunc(a);
+
+   printf("\t%s",a);
+
+   if (j & 2)
+      printf(",cl\n");
+   else
+      printf(",*1\n");
+
+   objout();
+
+}/* * * * * * * * * * * END OF srhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for the ASCII-adjust opcodes.       *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+aahand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF aahand()  * * * * * * * * * */
+
+   register int k;
+
+   objini(j);
+
+   FETCH(k);
+
+   if (k != 0x0a)
+      {
+      badseq(j,k);
+      return;
+      }
+
+   printf("%s\n",optab[j].text);
+
+   objout();
+
+}/* * * * * * * * * * * END OF aahand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for port I/O opcodes  which specify *
+  * the port address as an immediate operand.               *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+iohand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF iohand()  * * * * * * * * * */
+
+   register int k;
+
+   objini(j);
+
+   FETCH(k);
+
+   printf("%s\t0x%02.2x\n",optab[j].text,k);
+
+   objout();
+
+}/* * * * * * * * * * * END OF iohand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the  handler  for opcodes  which  perform  long *
+  * (sixteen-bit) relative jumps and calls.                 *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+ljhand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF ljhand()  * * * * * * * * * */
+
+   register int k;
+   int m, n;
+
+   objini(j);
+
+   FETCH(m);
+   FETCH(n);
+
+   k = (n << 8) | m;
+
+   printf("%s\t%s\t\t| loc %05.5lx\n",optab[j].text,
+    lookup((PC + k + 1L),N_TEXT,LOOK_LNG,(PC - 1L)),
+    (PC + k + 1L));
+
+   objout();
+
+}/* * * * * * * * * * * END OF ljhand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for a pair of oddball opcodes (0xf6 *
+  * and 0xf7) which perform miscellaneous arithmetic opera- *
+  * tions not dealt with elsewhere.                         *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+mahand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF mahand()  * * * * * * * * * */
+
+   char *a;
+   register int k;
+   char b[80];
+
+   objini(j);
+
+   FETCH(k);
+
+   a = mtrans((j & 0xfd),(k & 0xc7),TR_STD);
+
+   mtrunc(a);
+
+   switch (((k = objbuf[1]) & 0x38) >> 3)
+      {
+      case 0 :
+         printf("\ttest");
+         break;
+      case 1 :
+         badseq(j,k);
+         return;
+      case 2 :
+         printf("\tnot");
+         break;
+      case 3 :
+         printf("\tneg");
+         break;
+      case 4 :
+         printf("\tmul");
+         break;
+      case 5 :
+         printf("\timul");
+         break;
+      case 6 :
+         printf("\tdiv");
+         break;
+      case 7 :
+         printf("\tidiv");
+         break;
+      }
+
+   if ( ! (j & 1) )
+      putchar('b');
+
+   printf("\t%s",a);
+
+   if (k & 0x38)
+      putchar('\n');
+   else
+      if (j & 1)
+         {
+         FETCH(j);
+         FETCH(k);
+         k = (k << 8) | j;
+         if (lookext((long)(k),(PC - 1),b))
+            printf(",#%s\n",b);
+         else
+            printf(",#%d\n",k);
+         }
+      else
+         {
+         FETCH(k);
+         printf(",*%d\n",k);
+         }
+
+   objout();
+
+}/* * * * * * * * * * * END OF mahand() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the handler for miscellaneous jump, call, push, *
+  * and increment/decrement opcodes  (0xfe and 0xff)  which *
+  * are not dealt with elsewhere.                           *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+mjhand(j)
+
+   register int j;            /* Pointer to optab[] entry   */
+
+{/* * * * * * * * * *  START OF mjhand()  * * * * * * * * * */
+
+   char *a;
+   register int k;
+
+   objini(j);
+
+   FETCH(k);
+
+   a = mtrans((j & 0xfd),(k & 0xc7),TR_STD);
+
+   mtrunc(a);
+
+   switch (((k = objbuf[1]) & 0x38) >> 3)
+      {
+      case 0 :
+         printf("\tinc");
+         if ( ! (j & 1) )
+            putchar('b');
+         putchar('\t');
+         break;
+      case 1 :
+         printf("\tdec");
+         if ( ! (j & 1) )
+            putchar('b');
+         putchar('\t');
+         break;
+      case 2 :
+         if (j & 1)
+            printf("\tcall\t@");
+         else
+            goto BAD;
+         break;
+      case 3 :
+         if (j & 1)
+            printf("\tcalli\t@");
+         else
+            goto BAD;
+         break;
+      case 4 :
+         if (j & 1)
+            printf("\tjmp\t@");
+         else
+            goto BAD;
+         break;
+      case 5 :
+         if (j & 1)
+            printf("\tjmpi\t@");
+         else
+            goto BAD;
+         break;
+      case 6 :
+         if (j & 1)
+            printf("\tpush\t");
+         else
+            goto BAD;
+         break;
+      case 7 :
+ BAD :
+         badseq(j,k);
+         return;
+      }
+
+   printf("%s\n",a);
+
+   objout();
+
+}/* * * * * * * * * * * END OF mjhand() * * * * * * * * * * */
+
+
diff --git a/dis88/dismain.c b/dis88/dismain.c
new file mode 100644
index 0000000..f9ec6c5
--- /dev/null
+++ b/dis88/dismain.c
@@ -0,0 +1,650 @@
+static char *sccsid =  "@(#) dismain.c, Ver. 2.1 created 00:00:00 87/09/01";
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  *  Copyright (C) 1987 G. M. Harding, all rights reserved  *
+  *                                                         *
+  * Permission to copy and  redistribute is hereby granted, *
+  * provided full source code,  with all copyright notices, *
+  * accompanies any redistribution.                         *
+  *                                                         *
+  * This file  contains  the source  code for the  machine- *
+  * independent  portions of a disassembler  program to run *
+  * in a Unix (System III) environment.  It expects, as its *
+  * input, a file in standard a.out format, optionally con- *
+  * taining symbol table information.  If a symbol table is *
+  * present, it will be used in the disassembly; otherwise, *
+  * all address references will be literal (absolute).      *
+  *                                                         *
+  * The disassembler  program was originally written for an *
+  * Intel 8088 CPU.  However, all details of the actual CPU *
+  * architecture are hidden in three machine-specific files *
+  * named  distabs.c,  dishand.c,  and disfp.c  (the latter *
+  * file is specific to the 8087 numeric co-processor). The *
+  * code in this file is generic,  and should require mini- *
+  * mal revision if a different CPU is to be targeted. If a *
+  * different version of Unix is to be targeted, changes to *
+  * this file may be necessary, and if a completely differ- *
+  * ent OS is to be targeted, all bets are off.             *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include "dis.h"              /* Disassembler declarations  */
+
+extern char *release;         /* Contains release string    */
+static char *IFILE = NULL;    /* Points to input file name  */
+static char *OFILE = NULL;    /* Points to output file name */
+static char *PRG;             /* Name of invoking program   */
+static unsigned long zcount;  /* Consecutive "0" byte count */
+int objflg = 0;               /* Flag: output object bytes  */
+
+#define unix 1
+#define i8086 1
+#define ibmpc 1
+
+#if unix && i8086 && ibmpc    /* Set the CPU identifier     */
+static int cpuid = 1;
+#else
+static int cpuid = 0;
+#endif
+
+_PROTOTYPE(static void usage, (char *s ));
+_PROTOTYPE(static void fatal, (char *s, char *t ));
+_PROTOTYPE(static void zdump, (unsigned long beg ));
+_PROTOTYPE(static void prolog, (void));
+_PROTOTYPE(static void distext, (void));
+_PROTOTYPE(static void disdata, (void));
+_PROTOTYPE(static void disbss, (void));
+
+_PROTOTYPE(static char *invoker, (char *s));
+_PROTOTYPE(static int objdump, (char *c));
+_PROTOTYPE(static char *getlab, (int type));
+_PROTOTYPE(static void prolog, (void));
+
+ /* * * * * * * MISCELLANEOUS UTILITY FUNCTIONS * * * * * * */
+
+static void
+usage(s)
+   register char *s;
+{
+   fprintf(stderr,"Usage: %s [-o] ifile [ofile]\n",s);
+   exit(-1);
+}
+
+static void
+fatal(s,t)
+   register char *s, *t;
+{
+   fprintf(stderr,"%s: %s\n",s,t);
+   exit(-1);
+}
+
+static void
+zdump(beg)
+   unsigned long beg;
+{
+   beg = PC - beg;
+   if (beg > 1L)
+      printf("\t.zerow\t%ld\n",(beg >> 1));
+   if (beg & 1L)
+      printf("\t.byte\t0\n");
+}
+
+static char *
+invoker(s)
+   register char *s;
+{
+   register int k;
+
+   k = strlen(s);
+
+   while (k--)
+      if (s[k] == '/')
+         {
+         s += k;
+         ++s;
+         break;
+         }
+
+   return (s);
+}
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This rather tricky routine supports the disdata() func- *
+  * tion.  Its job is to output the code for a sequence  of *
+  * data bytes whenever the object buffer is full,  or when *
+  * a symbolic label is to be output. However, it must also *
+  * keep track of  consecutive  zero words so that  lengthy *
+  * stretches of null data can be  compressed by the use of *
+  * an  appropriate  assembler  pseudo-op.  It does this by *
+  * setting and testing a file-wide  flag which counts suc- *
+  * cessive full buffers of null data. The function returns *
+  * a logical  TRUE value if it outputs  anything,  logical *
+  * FALSE otherwise.  (This enables disdata()  to determine *
+  * whether to output a new  synthetic  label when there is *
+  * no symbol table.)                                       *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static int
+objdump(c)
+
+   register char *c;
+
+{/* * * * * * * * * * START OF  objdump() * * * * * * * * * */
+
+   register int k;
+   int retval = 0;
+
+   if (objptr == OBJMAX)
+      {
+      for (k = 0; k < OBJMAX; ++k)
+         if (objbuf[k])
+            break;
+      if (k == OBJMAX)
+         {
+         zcount += k;
+         objptr = 0;
+         if (c == NULL)
+            return (retval);
+         }
+      }
+
+   if (zcount)
+      {
+      printf("\t.zerow\t%ld\n",(zcount >> 1));
+      ++retval;
+      zcount = 0L;
+      }
+
+   if (objptr)
+      {
+      printf("\t.byte\t");
+      ++retval;
+      }
+   else
+      return (retval);
+
+   for (k = 0; k < objptr; ++k)
+      {
+      printf("0x%02.2x",objbuf[k]);
+      if (k < (objptr - 1))
+         putchar(',');
+      else
+         putchar('\n');
+      }
+
+   objptr = 0;
+
+   return (retval);
+
+}/* * * * * * * * * *  END OF  objdump()  * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This  routine,  called  at the  beginning  of the input *
+  * cycle for each object byte,  and before any interpreta- *
+  * tion is  attempted,  searches  the symbol table for any *
+  * symbolic  name with a value  corresponding  to the cur- *
+  * rent PC and a type  corresponding  to the segment  type *
+  * (i.e.,  text, data, or bss) specified by the function's *
+  * argument. If any such name is found, a pointer to it is *
+  * returned; otherwise, a NULL pointer is returned.        *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static char *
+getlab(type)
+register int type;
+{/* * * * * * * * * *  START OF getlab()  * * * * * * * * * */
+
+   register int k;
+   static char b[48], c[32];
+
+   if (symptr < 0)
+      if ((type == N_TEXT)
+       || ((type == N_DATA) && ( ! objptr ) && ( ! zcount )))
+         {
+         if (type == N_TEXT)
+            sprintf(b,"T%05.5lx:",PC);
+         else
+            sprintf(b,"D%05.5lx:",PC);
+         return (b);
+         }
+      else
+         return (NULL);
+
+   for (k = 0; k <= symptr; ++k)
+      if ((symtab[k].n_value == PC)
+       && ((symtab[k].n_sclass & N_SECT) == type))
+         {
+         sprintf(b,"%s:\n",getnam(k));
+         if (objflg && (type != N_TEXT))
+            sprintf(c,"| %05.5lx\n",PC);
+         strcat(b,c);
+         return (b);
+         }
+
+   return (NULL);
+
+}/* * * * * * * * * * * END OF getlab() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This routine  performs a preliminary scan of the symbol *
+  * table,  before disassembly begins, and outputs declara- *
+  * tions of globals and constants.                         *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static void
+prolog()
+
+{/* * * * * * * * * *  START OF prolog()  * * * * * * * * * */
+
+   register int j, flag;
+
+   fflush(stdout);
+
+   if (symptr < 0)
+      return;
+
+   for (j = flag = 0; j <= symptr; ++j)
+      if ((symtab[j].n_sclass & N_CLASS) == C_EXT)
+         if (((symtab[j].n_sclass & N_SECT) > N_UNDF)
+          && ((symtab[j].n_sclass & N_SECT) < N_COMM))
+            {
+            char *c = getnam(j);
+            printf("\t.globl\t%s",c);
+            if (++flag == 1)
+               {
+               putchar('\t');
+               if (strlen(c) < 8)
+                  putchar('\t');
+               printf("| Internal global\n");
+               }
+            else
+               putchar('\n');
+            }
+         else
+            if (symtab[j].n_value)
+               {
+               char *c = getnam(j);
+               printf("\t.comm\t%s,0x%08.8lx",c,
+                symtab[j].n_value);
+               if (++flag == 1)
+                  printf("\t| Internal global\n");
+               else
+                  putchar('\n');
+               }
+
+   if (flag)
+      putchar('\n');
+   fflush(stdout);
+
+   for (j = flag = 0; j <= relptr; ++j)
+      if (relo[j].r_symndx < S_BSS)
+         {
+         char *c = getnam(relo[j].r_symndx);
+         ++flag;
+         printf("\t.globl\t%s",c);
+         putchar('\t');
+         if (strlen(c) < 8)
+            putchar('\t');
+         printf("| Undef: %05.5lx\n",relo[j].r_vaddr);
+         }
+
+   if (flag)
+      putchar('\n');
+   fflush(stdout);
+
+   for (j = flag = 0; j <= symptr; ++j)
+      if ((symtab[j].n_sclass & N_SECT) == N_ABS)
+         {
+         char *c = getnam(j);
+         printf("%s=0x%08.8lx",c,symtab[j].n_value);
+         if (++flag == 1)
+            {
+            printf("\t\t");
+            if (strlen(c) < 5)
+               putchar('\t');
+            printf("| Literal\n");
+            }
+         else
+            putchar('\n');
+         }
+
+   if (flag)
+      putchar('\n');
+   fflush(stdout);
+
+}/* * * * * * * * * * * END OF prolog() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This function is  responsible  for  disassembly  of the *
+  * object file's text segment.                             *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static void
+distext()
+
+{/* * * * * * * * * * START OF  distext() * * * * * * * * * */
+
+   char *c;
+   register int j;
+   register void (*f)();
+
+   for (j = 0; j < (int)(HDR.a_hdrlen); ++j)
+      getchar();
+
+   printf("| %s, %s\n\n",PRG,release);
+
+   printf("| @(");
+
+   printf("#)\tDisassembly of %s",IFILE);
+
+   if (symptr < 0)
+      printf(" (no symbols)\n\n");
+   else
+      printf("\n\n");
+
+   if (HDR.a_flags & A_EXEC)
+      printf("| File is executable\n\n");
+
+   if (HDR.a_flags & A_SEP)
+      {
+      printf("| File has split I/D space, and may have\n");
+      printf("| extraneous instructions in text segment\n\n");
+      }
+
+   prolog();
+
+   printf("\t.text\t\t\t| loc = %05.5lx, size = %05.5lx\n\n",
+    PC,HDR.a_text);
+   fflush(stdout);
+
+   segflg = 0;
+
+   for (PC = 0L; PC < HDR.a_text; ++PC)
+      {
+      j = getchar() & 0xff;
+      if ((j == 0) && ((PC + 1L) == HDR.a_text))
+         {
+         ++PC;
+         break;
+         }
+      if ((c = getlab(N_TEXT)) != NULL)
+         printf("%s",c);
+      f = optab[j].func;
+      (*f)(j);
+      fflush(stdout);
+      }
+
+}/* * * * * * * * * *  END OF  distext()  * * * * * * * * * */
+
+Fetch()
+{
+   int p;
+   ++PC;
+   if( symptr>=0 && getlab(N_TEXT) != NULL ) { --PC; return -1; }
+   
+/* #define FETCH(p)  ++PC; p = getchar() & 0xff; objbuf[objptr++] = p */
+   p = getchar() & 0xff;
+   objbuf[objptr++] = p;
+   return p;
+}
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This  function  handles the object file's data segment. *
+  * There is no good way to disassemble a data segment, be- *
+  * cause it is  impossible  to tell,  from the object code *
+  * alone,  what each data byte refers to.  If it refers to *
+  * an external symbol,  the reference can be resolved from *
+  * the relocation table, if there is one.  However,  if it *
+  * refers to a static symbol,  it cannot be  distinguished *
+  * from numeric, character, or other pointer data. In some *
+  * cases,  one might make a semi-educated  guess as to the *
+  * nature of the data,  but such  guesses  are  inherently *
+  * haphazard,  and they are  bound to be wrong a good por- *
+  * tion of the time.  Consequently,  the data  segment  is *
+  * disassembled  as a byte  stream,  which will satisfy no *
+  * one but which, at least, will never mislead anyone.     *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static void
+disdata()
+
+{/* * * * * * * * * * START OF  disdata() * * * * * * * * * */
+
+   register char *c;
+   register int j;
+   unsigned long end;
+
+   putchar('\n');
+
+   if (HDR.a_flags & A_SEP)
+      {
+      PC = 0L;
+      end = HDR.a_data;
+      }
+   else
+      end = HDR.a_text + HDR.a_data;
+
+   printf("\t.data\t\t\t| loc = %05.5lx, size = %05.5lx\n\n",
+    PC,HDR.a_data);
+
+   segflg = 0;
+
+   for (objptr = 0, zcount = 0L; PC < end; ++PC)
+      {
+      if ((c = getlab(N_DATA)) != NULL)
+         {
+         objdump(c);
+         printf("%s",c);
+         }
+      if (objptr >= OBJMAX)
+         if (objdump(NULL) && (symptr < 0))
+            printf("D%05.5lx:",PC);
+      j = getchar() & 0xff;
+      objbuf[objptr++] = j;
+      }
+
+   objdump("");
+
+}/* * * * * * * * * *  END OF  disdata()  * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This  function  handles the object  file's bss segment. *
+  * Disassembly of the bss segment is easy,  because every- *
+  * thing in it is zero by definition.                      *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static void disbss()
+
+{/* * * * * * * * * *  START OF disbss()  * * * * * * * * * */
+
+   register int j;
+   register char *c;
+   unsigned long beg, end;
+
+   putchar('\n');
+
+   if (HDR.a_flags & A_SEP)
+      end = HDR.a_data + HDR.a_bss;
+   else
+      end = HDR.a_text + HDR.a_data + HDR.a_bss;
+
+   printf("\t.bss\t\t\t| loc = %05.5lx, size = %05.5lx\n\n",
+    PC,HDR.a_bss);
+
+   segflg = 0;
+
+   for (beg = PC; PC < end; ++PC)
+      if ((c = getlab(N_BSS)) != NULL)
+         {
+         if (PC > beg)
+            {
+            zdump(beg);
+            beg = PC;
+            }
+         printf("%s",c);
+         }
+
+   if (PC > beg)
+      zdump(beg);
+
+}/* * * * * * * * * * * END OF disbss() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This is the program  entry  point.  The command line is *
+  * searched for an input file name, which must be present. *
+  * An optional output file name is also permitted; if none *
+  * is found, standard output is the default.  One command- *
+  * line option is available:  "-o",  which causes the pro- *
+  * gram to include  object code in comments along with its *
+  * mnemonic output.                                        *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+main(argc,argv)
+
+   int argc;                  /* Command-line args from OS  */
+   register char **argv;
+
+{/* * * * * * * * * * * START OF main() * * * * * * * * * * */
+
+   char a[1024];
+   register int fd;
+   long taboff, tabnum;
+   long reloff, relnum;
+
+   PRG = invoker(*argv);
+
+   while (*++argv != NULL)    /* Process command-line args  */
+      if (**argv == '-')
+         switch (*++*argv)
+            {
+            case 'o' :
+               if (*++*argv)
+                  usage(PRG);
+               else
+                  ++objflg;
+               break;
+            default :
+               usage(PRG);
+            }
+      else
+         if (IFILE == NULL)
+            IFILE = *argv;
+         else if (OFILE == NULL)
+            OFILE = *argv;
+         else
+            usage(PRG);
+
+   if (IFILE == NULL)
+      usage(PRG);
+   else
+      if ((fd = open(IFILE,0)) < 0)
+         {
+         sprintf(a,"can't access input file %s",IFILE);
+         fatal(PRG,a);
+         }
+
+   if (OFILE != NULL)
+      if (freopen(OFILE,"w",stdout) == NULL)
+         {
+         sprintf(a,"can't open output file %s",OFILE);
+         fatal(PRG,a);
+         }
+
+   if ( ! cpuid )
+      fprintf(stderr,"%s: warning: host/cpu clash\n",PRG);
+
+   read(fd, (char *) &HDR,sizeof(struct exec));
+
+   if (BADMAG(HDR))
+      {
+      sprintf(a,"input file %s not in object format",IFILE);
+      fatal(PRG,a);
+      }
+
+   if (HDR.a_cpu != A_I8086)
+      {
+      sprintf(a,"%s is not an 8086/8088 object file",IFILE);
+      fatal(PRG,a);
+      }
+
+   if (HDR.a_hdrlen <= A_MINHDR)
+      HDR.a_trsize = HDR.a_drsize = 0L;
+      HDR.a_tbase = HDR.a_dbase = 0L;
+/*   AST emergency patch
+      HDR.a_lnums = HDR.a_toffs = 0L;
+*/
+
+   reloff = HDR.a_text        /* Compute reloc data offset  */
+          + HDR.a_data
+          + (long)(HDR.a_hdrlen);
+
+   relnum =
+      (HDR.a_trsize + HDR.a_drsize) / sizeof(struct reloc);
+
+   taboff = reloff            /* Compute name table offset  */
+          + HDR.a_trsize
+          + HDR.a_drsize;
+
+   tabnum = HDR.a_syms / sizeof(struct nlist);
+
+   if (relnum > MAXSYM)
+      fatal(PRG,"reloc table overflow");
+
+   if (tabnum > MAXSYM)
+      fatal(PRG,"symbol table overflow");
+
+   if (relnum)                            /* Get reloc data */
+      if (lseek(fd,reloff,0) != reloff)
+         fatal(PRG,"lseek error");
+      else
+         {
+         for (relptr = 0; relptr < relnum; ++relptr)
+            read(fd, (char *) &relo[relptr],sizeof(struct reloc));
+         relptr--;
+         }
+
+   if (tabnum)                            /* Read in symtab */
+      if (lseek(fd,taboff,0) != taboff)
+         fatal(PRG,"lseek error");
+      else
+         {
+         for (symptr = 0; symptr < tabnum; ++symptr)
+            read(fd, (char *) &symtab[symptr],sizeof(struct nlist));
+         symptr--;
+         }
+   else
+      fprintf(stderr,"%s: warning: no symbols\n",PRG);
+
+   close(fd);
+
+   if (freopen(IFILE,"r",stdin) == NULL)
+      {
+      sprintf(a,"can't reopen input file %s",IFILE);
+      fatal(PRG,a);
+      }
+
+   distext();
+
+   disdata();
+
+   disbss();
+
+   exit(0);
+
+}/* * * * * * * * * * *  END OF main()  * * * * * * * * * * */
diff --git a/dis88/disrel.c b/dis88/disrel.c
new file mode 100644
index 0000000..37f3221
--- /dev/null
+++ b/dis88/disrel.c
@@ -0,0 +1,30 @@
+static char *copyright =
+   "@(#) Copyright (C) 1987 G. M. Harding, all rights reserved";
+
+static char *sccsid =
+   "@(#) disrel.c, Ver. 2.1 created 00:00:00 87/09/01";
+
+char *release =
+   "release 2.1 (MINIX)";
+
+ /*
+ **
+ ** This file documents the major revisions to the 8088 sym-
+ ** bolic disassembler. It also contains the release string
+ ** which is output at the head of each disassembly, and the
+ ** copyright string which must be incorporated in any code
+ ** distribution.
+ **
+ ** Permission to copy and redistribute is hereby granted,
+ ** provided full source code, with all copyright notices,
+ ** accompanies any redistribution.
+ **
+ ** REVISION HISTORY:
+ **
+ ** SEP 87:
+ **    After internal shakeout, released on Usenet.
+ **
+ ** JUN 88:
+ **    Ported to MINIX
+ */
+
diff --git a/dis88/distabs.c b/dis88/distabs.c
new file mode 100644
index 0000000..283fe42
--- /dev/null
+++ b/dis88/distabs.c
@@ -0,0 +1,708 @@
+static char *sccsid =
+   "@(#) distabs.c, Ver. 2.1 created 00:00:00 87/09/01";
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  *  Copyright (C) 1987 G. M. Harding, all rights reserved  *
+  *                                                         *
+  * Permission to copy and  redistribute is hereby granted, *
+  * provided full source code,  with all copyright notices, *
+  * accompanies any redistribution.                         *
+  *                                                         *
+  * This file  contains  the  lookup  tables and other data *
+  * structures for the Intel 8088 symbolic disassembler. It *
+  * also contains a few global  routines  which  facilitate *
+  * access to the tables,  for use primarily by the handler *
+  * functions.                                              *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include "dis.h"              /* Disassembler declarations  */
+
+struct exec HDR;              /* Used to hold header info   */
+
+struct nlist symtab[MAXSYM];  /* Array of symbol table info */
+
+struct reloc relo[MAXSYM];    /* Array of relocation info   */
+
+int symptr = -1,              /* Index into symtab[]        */
+    relptr = -1;              /* Index into relo[]          */
+
+char *REGS[] =                /* Table of register names    */
+   {
+   "al", "cl", "dl", "bl", "ah", "ch", "dh", "bh",
+   "ax", "cx", "dx", "bx", "sp", "bp", "si", "di",
+   "es", "cs", "ss", "ds"
+   };
+
+char *REGS0[] =               /* Mode 0 register name table */
+   {
+   "bx_si", "bx_di", "bp_si", "bp_di", "si", "di", "", "bx"
+   };
+
+char *REGS1[] =               /* Mode 1 register name table */
+   {
+   "bx_si", "bx_di", "bp_si", "bp_di", "si", "di", "bp", "bx"
+   };
+
+int symrank[6][6] =           /* Symbol type/rank matrix    */
+   {
+              /* UND  ABS  TXT  DAT  BSS  COM */
+   /* UND */      5,   4,   1,   2,   3,   0,
+   /* ABS */      1,   5,   4,   3,   2,   0,
+   /* TXT */      4,   1,   5,   3,   2,   0,
+   /* DAT */      3,   1,   2,   5,   4,   0,
+   /* BSS */      3,   1,   2,   4,   5,   0,
+   /* COM */      2,   0,   1,   3,   4,   5
+   };
+
+ /* * * * * * * * * * * * OPCODE DATA * * * * * * * * * * * */
+
+char ADD[]   = "\tadd",             /* Mnemonics by family  */
+     OR[]    = "\tor",
+     ADC[]   = "\tadc",
+     SBB[]   = "\tsbb",
+     AND[]   = "\tand",
+     SUB[]   = "\tsub",
+     XOR[]   = "\txor",
+     CMP[]   = "\tcmp",
+     NOT[]   = "\tnot",
+     NEG[]   = "\tneg",
+     MUL[]   = "\tmul",
+     DIV[]   = "\tdiv",
+     MOV[]   = "\tmov",
+     ESC[]   = "\tesc",
+     TEST[]  = "\ttest",
+     AMBIG[] = "",
+     ROL[]   = "\trol",
+     ROR[]   = "\tror",
+     RCL[]   = "\trcl",
+     RCR[]   = "\trcr",
+     SAL[]   = "\tsal",
+     SHR[]   = "\tshr",
+     SHL[]   = "\tshl",
+     SAR[]   = "\tsar";
+
+char *OPFAM[] =                     /* Family lookup table  */
+   {
+   ADD, OR, ADC, SBB, AND, SUB, XOR, CMP,
+   NOT, NEG, MUL, DIV, MOV, ESC, TEST, AMBIG,
+   ROL, ROR, RCL, RCR, SAL, SHR, SHL, SAR
+   };
+
+struct opcode optab[] =             /* Table of opcode data */
+   {
+   ADD,              aohand,  2,    4,             /* 0x00  */
+   ADD,              aohand,  2,    4,             /* 0x01  */
+   ADD,              aohand,  2,    4,             /* 0x02  */
+   ADD,              aohand,  2,    4,             /* 0x03  */
+   ADD,              aohand,  2,    2,             /* 0x04  */
+   ADD,              aohand,  3,    3,             /* 0x05  */
+   "\tpush\tes",     sbhand,  1,    1,             /* 0x06  */
+   "\tpop\tes",      sbhand,  1,    1,             /* 0x07  */
+   OR,               aohand,  2,    4,             /* 0x08  */
+   OR,               aohand,  2,    4,             /* 0x09  */
+   OR,               aohand,  2,    4,             /* 0x0a  */
+   OR,               aohand,  2,    4,             /* 0x0b  */
+   OR,               aohand,  2,    2,             /* 0x0c  */
+   OR,               aohand,  3,    3,             /* 0x0d  */
+   "\tpush\tcs",     sbhand,  1,    1,             /* 0x0e  */
+   NULL,             dfhand,  0,    0,             /* 0x0f  */
+   ADC,              aohand,  2,    4,             /* 0x10  */
+   ADC,              aohand,  2,    4,             /* 0x11  */
+   ADC,              aohand,  2,    4,             /* 0x12  */
+   ADC,              aohand,  2,    4,             /* 0x13  */
+   ADC,              aohand,  2,    2,             /* 0x14  */
+   ADC,              aohand,  3,    3,             /* 0x15  */
+   "\tpush\tss",     sbhand,  1,    1,             /* 0x16  */
+   "\tpop\tss",      sbhand,  1,    1,             /* 0x17  */
+   SBB,              aohand,  2,    4,             /* 0x18  */
+   SBB,              aohand,  2,    4,             /* 0x19  */
+   SBB,              aohand,  2,    4,             /* 0x1a  */
+   SBB,              aohand,  2,    4,             /* 0x1b  */
+   SBB,              aohand,  2,    2,             /* 0x1c  */
+   SBB,              aohand,  3,    3,             /* 0x1d  */
+   "\tpush\tds",     sbhand,  1,    1,             /* 0x1e  */
+   "\tpop\tds",      sbhand,  1,    1,             /* 0x1f  */
+   AND,              aohand,  2,    4,             /* 0x20  */
+   AND,              aohand,  2,    4,             /* 0x21  */
+   AND,              aohand,  2,    4,             /* 0x22  */
+   AND,              aohand,  2,    4,             /* 0x23  */
+   AND,              aohand,  2,    2,             /* 0x24  */
+   AND,              aohand,  3,    3,             /* 0x25  */
+   "\tseg\tes",      sbhand,  1,    1,             /* 0x26  */
+   "\tdaa",          sbhand,  1,    1,             /* 0x27  */
+   SUB,              aohand,  2,    4,             /* 0x28  */
+   SUB,              aohand,  2,    4,             /* 0x29  */
+   SUB,              aohand,  2,    4,             /* 0x2a  */
+   SUB,              aohand,  2,    4,             /* 0x2b  */
+   SUB,              aohand,  2,    2,             /* 0x2c  */
+   SUB,              aohand,  3,    3,             /* 0x2d  */
+   "\tseg\tcs",      sbhand,  1,    1,             /* 0x2e  */
+   "\tdas",          sbhand,  1,    1,             /* 0x2f  */
+   XOR,              aohand,  2,    4,             /* 0x30  */
+   XOR,              aohand,  2,    4,             /* 0x31  */
+   XOR,              aohand,  2,    4,             /* 0x32  */
+   XOR,              aohand,  2,    4,             /* 0x33  */
+   XOR,              aohand,  2,    2,             /* 0x34  */
+   XOR,              aohand,  3,    3,             /* 0x35  */
+   "\tseg\tss",      sbhand,  1,    1,             /* 0x36  */
+   "\taaa",          sbhand,  1,    1,             /* 0x37  */
+   CMP,              aohand,  2,    4,             /* 0x38  */
+   CMP,              aohand,  2,    4,             /* 0x39  */
+   CMP,              aohand,  2,    4,             /* 0x3a  */
+   CMP,              aohand,  2,    4,             /* 0x3b  */
+   CMP,              aohand,  2,    2,             /* 0x3c  */
+   CMP,              aohand,  3,    3,             /* 0x3d  */
+   "\tseg\tds",      sbhand,  1,    1,             /* 0x3e  */
+   "\taas",          sbhand,  1,    1,             /* 0x3f  */
+   "\tinc\tax",      sbhand,  1,    1,             /* 0x40  */
+   "\tinc\tcx",      sbhand,  1,    1,             /* 0x41  */
+   "\tinc\tdx",      sbhand,  1,    1,             /* 0x42  */
+   "\tinc\tbx",      sbhand,  1,    1,             /* 0x43  */
+   "\tinc\tsp",      sbhand,  1,    1,             /* 0x44  */
+   "\tinc\tbp",      sbhand,  1,    1,             /* 0x45  */
+   "\tinc\tsi",      sbhand,  1,    1,             /* 0x46  */
+   "\tinc\tdi",      sbhand,  1,    1,             /* 0x47  */
+   "\tdec\tax",      sbhand,  1,    1,             /* 0x48  */
+   "\tdec\tcx",      sbhand,  1,    1,             /* 0x49  */
+   "\tdec\tdx",      sbhand,  1,    1,             /* 0x4a  */
+   "\tdec\tbx",      sbhand,  1,    1,             /* 0x4b  */
+   "\tdec\tsp",      sbhand,  1,    1,             /* 0x4c  */
+   "\tdec\tbp",      sbhand,  1,    1,             /* 0x4d  */
+   "\tdec\tsi",      sbhand,  1,    1,             /* 0x4e  */
+   "\tdec\tdi",      sbhand,  1,    1,             /* 0x4f  */
+   "\tpush\tax",     sbhand,  1,    1,             /* 0x50  */
+   "\tpush\tcx",     sbhand,  1,    1,             /* 0x51  */
+   "\tpush\tdx",     sbhand,  1,    1,             /* 0x52  */
+   "\tpush\tbx",     sbhand,  1,    1,             /* 0x53  */
+   "\tpush\tsp",     sbhand,  1,    1,             /* 0x54  */
+   "\tpush\tbp",     sbhand,  1,    1,             /* 0x55  */
+   "\tpush\tsi",     sbhand,  1,    1,             /* 0x56  */
+   "\tpush\tdi",     sbhand,  1,    1,             /* 0x57  */
+   "\tpop\tax",      sbhand,  1,    1,             /* 0x58  */
+   "\tpop\tcx",      sbhand,  1,    1,             /* 0x59  */
+   "\tpop\tdx",      sbhand,  1,    1,             /* 0x5a  */
+   "\tpop\tbx",      sbhand,  1,    1,             /* 0x5b  */
+   "\tpop\tsp",      sbhand,  1,    1,             /* 0x5c  */
+   "\tpop\tbp",      sbhand,  1,    1,             /* 0x5d  */
+   "\tpop\tsi",      sbhand,  1,    1,             /* 0x5e  */
+   "\tpop\tdi",      sbhand,  1,    1,             /* 0x5f  */
+   NULL,             dfhand,  0,    0,             /* 0x60  */
+   NULL,             dfhand,  0,    0,             /* 0x61  */
+   NULL,             dfhand,  0,    0,             /* 0x62  */
+   NULL,             dfhand,  0,    0,             /* 0x63  */
+   NULL,             dfhand,  0,    0,             /* 0x64  */
+   NULL,             dfhand,  0,    0,             /* 0x65  */
+   NULL,             dfhand,  0,    0,             /* 0x66  */
+   NULL,             dfhand,  0,    0,             /* 0x67  */
+   NULL,             dfhand,  0,    0,             /* 0x68  */
+   NULL,             dfhand,  0,    0,             /* 0x69  */
+   NULL,             dfhand,  0,    0,             /* 0x6a  */
+   NULL,             dfhand,  0,    0,             /* 0x6b  */
+   NULL,             dfhand,  0,    0,             /* 0x6c  */
+   NULL,             dfhand,  0,    0,             /* 0x6d  */
+   NULL,             dfhand,  0,    0,             /* 0x6e  */
+   NULL,             dfhand,  0,    0,             /* 0x6f  */
+   "\tjo",           sjhand,  2,    2,             /* 0x70  */
+   "\tjno",          sjhand,  2,    2,             /* 0x71  */
+   "\tjc",           sjhand,  2,    2,             /* 0x72  */
+   "\tjnc",          sjhand,  2,    2,             /* 0x73  */
+   "\tjz",           sjhand,  2,    2,             /* 0x74  */
+   "\tjnz",          sjhand,  2,    2,             /* 0x75  */
+   "\tjna",          sjhand,  2,    2,             /* 0x76  */
+   "\tja",           sjhand,  2,    2,             /* 0x77  */
+   "\tjs",           sjhand,  2,    2,             /* 0x78  */
+   "\tjns",          sjhand,  2,    2,             /* 0x79  */
+   "\tjp",           sjhand,  2,    2,             /* 0x7a  */
+   "\tjnp",          sjhand,  2,    2,             /* 0x7b  */
+   "\tjl",           sjhand,  2,    2,             /* 0x7c  */
+   "\tjnl",          sjhand,  2,    2,             /* 0x7d  */
+   "\tjng",          sjhand,  2,    2,             /* 0x7e  */
+   "\tjg",           sjhand,  2,    2,             /* 0x7f  */
+   AMBIG,            imhand,  3,    5,             /* 0x80  */
+   AMBIG,            imhand,  4,    6,             /* 0x81  */
+   AMBIG,            imhand,  3,    5,             /* 0x82  */
+   AMBIG,            imhand,  3,    5,             /* 0x83  */
+   TEST,             mvhand,  2,    4,             /* 0x84  */
+   TEST,             mvhand,  2,    4,             /* 0x85  */
+   "\txchg",         mvhand,  2,    4,             /* 0x86  */
+   "\txchg",         mvhand,  2,    4,             /* 0x87  */
+   MOV,              mvhand,  2,    4,             /* 0x88  */
+   MOV,              mvhand,  2,    4,             /* 0x89  */
+   MOV,              mvhand,  2,    4,             /* 0x8a  */
+   MOV,              mvhand,  2,    4,             /* 0x8b  */
+   MOV,              mshand,  2,    4,             /* 0x8c  */
+   "\tlea",          mvhand,  2,    4,             /* 0x8d  */
+   MOV,              mshand,  2,    4,             /* 0x8e  */
+   "\tpop",          pohand,  2,    4,             /* 0x8f  */
+   "\tnop",          sbhand,  1,    1,             /* 0x90  */
+   "\txchg\tax,cx",  sbhand,  1,    1,             /* 0x91  */
+   "\txchg\tax,dx",  sbhand,  1,    1,             /* 0x92  */
+   "\txchg\tax,bx",  sbhand,  1,    1,             /* 0x93  */
+   "\txchg\tax,sp",  sbhand,  1,    1,             /* 0x94  */
+   "\txchg\tax,bp",  sbhand,  1,    1,             /* 0x95  */
+   "\txchg\tax,si",  sbhand,  1,    1,             /* 0x96  */
+   "\txchg\tax,di",  sbhand,  1,    1,             /* 0x97  */
+   "\tcbw",          sbhand,  1,    1,             /* 0x98  */
+   "\tcwd",          sbhand,  1,    1,             /* 0x99  */
+   "\tcalli",        cihand,  5,    5,             /* 0x9a  */
+   "\twait",         sbhand,  1,    1,             /* 0x9b  */
+   "\tpushf",        sbhand,  1,    1,             /* 0x9c  */
+   "\tpopf",         sbhand,  1,    1,             /* 0x9d  */
+   "\tsahf",         sbhand,  1,    1,             /* 0x9e  */
+   "\tlahf",         sbhand,  1,    1,             /* 0x9f  */
+   MOV,              mqhand,  3,    3,             /* 0xa0  */
+   MOV,              mqhand,  3,    3,             /* 0xa1  */
+   MOV,              mqhand,  3,    3,             /* 0xa2  */
+   MOV,              mqhand,  3,    3,             /* 0xa3  */
+   "\tmovb",         sbhand,  1,    1,             /* 0xa4  */
+   "\tmovw",         sbhand,  1,    1,             /* 0xa5  */
+   "\tcmpb",         sbhand,  1,    1,             /* 0xa6  */
+   "\tcmpw",         sbhand,  1,    1,             /* 0xa7  */
+   TEST,             tqhand,  2,    2,             /* 0xa8  */
+   TEST,             tqhand,  3,    3,             /* 0xa9  */
+   "\tstob",         sbhand,  1,    1,             /* 0xaa  */
+   "\tstow",         sbhand,  1,    1,             /* 0xab  */
+   "\tlodb",         sbhand,  1,    1,             /* 0xac  */
+   "\tlodw",         sbhand,  1,    1,             /* 0xad  */
+   "\tscab",         sbhand,  1,    1,             /* 0xae  */
+   "\tscaw",         sbhand,  1,    1,             /* 0xaf  */
+   "\tmov\tal,",     mihand,  2,    2,             /* 0xb0  */
+   "\tmov\tcl,",     mihand,  2,    2,             /* 0xb1  */
+   "\tmov\tdl,",     mihand,  2,    2,             /* 0xb2  */
+   "\tmov\tbl,",     mihand,  2,    2,             /* 0xb3  */
+   "\tmov\tah,",     mihand,  2,    2,             /* 0xb4  */
+   "\tmov\tch,",     mihand,  2,    2,             /* 0xb5  */
+   "\tmov\tdh,",     mihand,  2,    2,             /* 0xb6  */
+   "\tmov\tbh,",     mihand,  2,    2,             /* 0xb7  */
+   "\tmov\tax,",     mihand,  3,    3,             /* 0xb8  */
+   "\tmov\tcx,",     mihand,  3,    3,             /* 0xb9  */
+   "\tmov\tdx,",     mihand,  3,    3,             /* 0xba  */
+   "\tmov\tbx,",     mihand,  3,    3,             /* 0xbb  */
+   "\tmov\tsp,",     mihand,  3,    3,             /* 0xbc  */
+   "\tmov\tbp,",     mihand,  3,    3,             /* 0xbd  */
+   "\tmov\tsi,",     mihand,  3,    3,             /* 0xbe  */
+   "\tmov\tdi,",     mihand,  3,    3,             /* 0xbf  */
+   NULL,             dfhand,  0,    0,             /* 0xc0  */
+   NULL,             dfhand,  0,    0,             /* 0xc1  */
+   "\tret",          rehand,  3,    3,             /* 0xc2  */
+   "\tret",          sbhand,  1,    1,             /* 0xc3  */
+   "\tles",          mvhand,  2,    4,             /* 0xc4  */
+   "\tlds",          mvhand,  2,    4,             /* 0xc5  */
+   MOV,              mmhand,  3,    5,             /* 0xc6  */
+   MOV,              mmhand,  4,    6,             /* 0xc7  */
+   NULL,             dfhand,  0,    0,             /* 0xc8  */
+   NULL,             dfhand,  0,    0,             /* 0xc9  */
+   "\treti",         rehand,  3,    3,             /* 0xca  */
+   "\treti",         sbhand,  1,    1,             /* 0xcb  */
+   "\tint",          sbhand,  1,    1,             /* 0xcc  */
+   "\tint",          inhand,  2,    2,             /* 0xcd  */
+   "\tinto",         sbhand,  1,    1,             /* 0xce  */
+   "\tiret",         sbhand,  1,    1,             /* 0xcf  */
+   AMBIG,            srhand,  2,    4,             /* 0xd0  */
+   AMBIG,            srhand,  2,    4,             /* 0xd1  */
+   AMBIG,            srhand,  2,    4,             /* 0xd2  */
+   AMBIG,            srhand,  2,    4,             /* 0xd3  */
+   "\taam",          aahand,  2,    2,             /* 0xd4  */
+   "\taad",          aahand,  2,    2,             /* 0xd5  */
+   NULL,             dfhand,  0,    0,             /* 0xd6  */
+   "\txlat",         sbhand,  1,    1,             /* 0xd7  */
+   ESC,              eshand,  2,    2,             /* 0xd8  */
+   ESC,              eshand,  2,    2,             /* 0xd9  */
+   ESC,              eshand,  2,    2,             /* 0xda  */
+   ESC,              eshand,  2,    2,             /* 0xdb  */
+   ESC,              eshand,  2,    2,             /* 0xdc  */
+   ESC,              eshand,  2,    2,             /* 0xdd  */
+   ESC,              eshand,  2,    2,             /* 0xde  */
+   ESC,              eshand,  2,    2,             /* 0xdf  */
+   "\tloopne",       sjhand,  2,    2,             /* 0xe0  */
+   "\tloope",        sjhand,  2,    2,             /* 0xe1  */
+   "\tloop",         sjhand,  2,    2,             /* 0xe2  */
+   "\tjcxz",         sjhand,  2,    2,             /* 0xe3  */
+   "\tin",           iohand,  2,    2,             /* 0xe4  */
+   "\tinw",          iohand,  2,    2,             /* 0xe5  */
+   "\tout",          iohand,  2,    2,             /* 0xe6  */
+   "\toutw",         iohand,  2,    2,             /* 0xe7  */
+   "\tcall",         ljhand,  3,    3,             /* 0xe8  */
+   "\tjmp",          ljhand,  3,    3,             /* 0xe9  */
+   "\tjmpi",         cihand,  5,    5,             /* 0xea  */
+   "\tj",            sjhand,  2,    2,             /* 0xeb  */
+   "\tin",           sbhand,  1,    1,             /* 0xec  */
+   "\tinw",          sbhand,  1,    1,             /* 0xed  */
+   "\tout",          sbhand,  1,    1,             /* 0xee  */
+   "\toutw",         sbhand,  1,    1,             /* 0xef  */
+   "\tlock",         sbhand,  1,    1,             /* 0xf0  */
+   NULL,             dfhand,  0,    0,             /* 0xf1  */
+   "\trepnz",        sbhand,  1,    1,             /* 0xf2  */
+   "\trepz",         sbhand,  1,    1,             /* 0xf3  */
+   "\thlt",          sbhand,  1,    1,             /* 0xf4  */
+   "\tcmc",          sbhand,  1,    1,             /* 0xf5  */
+   AMBIG,            mahand,  2,    5,             /* 0xf6  */
+   AMBIG,            mahand,  2,    6,             /* 0xf7  */
+   "\tclc",          sbhand,  1,    1,             /* 0xf8  */
+   "\tstc",          sbhand,  1,    1,             /* 0xf9  */
+   "\tcli",          sbhand,  1,    1,             /* 0xfa  */
+   "\tsti",          sbhand,  1,    1,             /* 0xfb  */
+   "\tcld",          sbhand,  1,    1,             /* 0xfc  */
+   "\tstd",          sbhand,  1,    1,             /* 0xfd  */
+   AMBIG,            mjhand,  2,    4,             /* 0xfe  */
+   AMBIG,            mjhand,  2,    4              /* 0xff  */
+   };
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This simple routine  returns the name field of a symbol *
+  * table entry as a printable string.                      *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+char *
+getnam(k)
+
+   register int k;
+
+{/* * * * * * * * * *  START OF getnam()  * * * * * * * * * */
+
+   register int j;
+   static char a[sizeof(symtab->n_name)+1];
+
+   for (j = 0; j < sizeof(symtab[k].n_name); ++j)
+      if ( ! symtab[k].n_name[j] )
+         break;
+      else
+         a[j] = symtab[k].n_name[j];
+
+   a[j] = '\0';
+
+   return (a);
+
+}/* * * * * * * * * * * END OF getnam() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This function is  responsible  for mucking  through the *
+  * relocation  table in  search of  externally  referenced *
+  * symbols to be output as  operands.  It accepts two long *
+  * arguments: the code-segment location at which an extern *
+  * reference  is  expected,  and the offset value which is *
+  * embedded  in the  object  code and used at link time to *
+  * bias the external value.  In the most typical case, the *
+  * function will be called by lookup(), which always makes *
+  * a check for external names before  searching the symbol *
+  * table proper.  However,  it may also be called directly *
+  * by any function  (such as the  move-immediate  handler) *
+  * which wants to make an independent check for externals. *
+  * The caller is expected to supply, as the third argument *
+  * to the function,  a pointer to a character buffer large *
+  * enough to hold any possible  output  string.  Lookext() *
+  * will fill this  buffer and return a logical  TRUE if it *
+  * finds an extern reference;  otherwise, it will return a *
+  * logical FALSE, leaving the buffer undisturbed.          *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+int
+lookext(off,loc,buf)
+
+   long off, loc;
+   char *buf;
+
+{/* * * * * * * * * * START OF  lookext() * * * * * * * * * */
+
+   register int k;
+   char c[32];
+
+   if ((loc != -1L) && (relptr >= 0))
+      for (k = 0; k <= relptr; ++k)
+         if ((relo[k].r_vaddr == loc)
+          && (relo[k].r_symndx < S_BSS))
+            {
+            strcpy(buf,getnam(relo[k].r_symndx));
+            if (off)
+               {
+               if (off < 0)
+                  sprintf(c,"%ld",off);
+               else
+                  sprintf(c,"+%ld",off);
+               strcat(buf,c);
+               }
+            return (1);
+            }
+
+   return (0);
+
+}/* * * * * * * * * *  END OF  lookext()  * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This  function  finds an entry in the  symbol  table by *
+  * value.  Its input is a (long) machine address,  and its *
+  * output is a pointer to a string  containing  the corre- *
+  * sponding symbolic name. The function first searches the *
+  * relocation table for a possible external reference;  if *
+  * none is found,  a linear  search of the symbol table is *
+  * undertaken. If no matching symbol has been found at the *
+  * end of these searches,  the function  returns a pointer *
+  * to a string  containing the ASCII equivalent of the ad- *
+  * dress which was to be located,  so that,  regardless of *
+  * the success of the search,  the function's return value *
+  * is suitable for use as a memory-reference operand.  The *
+  * caller specifies the type of symbol to be found  (text, *
+  * data, bss, undefined,  absolute, or common) by means of *
+  * the function's  second  parameter.  The third parameter *
+  * specifies  the  format to be used in the event of a nu- *
+  * meric output:  zero for absolute format,  one for short *
+  * relative  format,  two for long  relative  format.  The *
+  * fourth  parameter is the address  which would appear in *
+  * the relocation table for the reference in question,  or *
+  * -1 if the relocation  table is not to be searched.  The *
+  * function attempts to apply a certain amount of intelli- *
+  * gence in its  selection  of symbols,  so it is possible *
+  * that,  in the absence of a type match,  a symbol of the *
+  * correct value but different type will be returned.      *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+char *
+lookup(addr,type,kind,ext)
+
+   long addr;              /* Machine address to be located */
+
+   int type,               /* Type of symbol to be matched  */
+       kind;               /* Addressing output mode to use */
+
+   long ext;               /* Value for extern ref, if any  */
+
+{/* * * * * * * * * *  START OF lookup()  * * * * * * * * * */
+
+   register int j, k;
+   static char b[80];
+
+   struct
+      {
+      int   i;
+      int   t;
+      }
+   best;
+
+   if (lookext(addr,ext,b))
+      return (b);
+
+   if (segflg)
+      if (segflg & 1)
+         type = N_TEXT;
+      else
+         type = N_DATA;
+
+   for (k = 0, best.i = -1; k <= symptr; ++k)
+      if (symtab[k].n_value == addr)
+         if ((j = symtab[k].n_sclass & N_SECT) == type)
+            {
+            best.t = j;
+            best.i = k;
+            break;
+            }
+         else if (segflg || (HDR.a_flags & A_SEP))
+            continue;
+         else if (best.i < 0)
+            best.t = j, best.i = k;
+         else if (symrank[type][j] > symrank[type][best.t])
+            best.t = j, best.i = k;
+
+   if (best.i >= 0)
+      return (getnam(best.i));
+
+   if (kind == LOOK_ABS)
+      sprintf(b,"0x%05.5x",addr);
+   else
+      {
+      long x = addr - (PC - kind);
+      if (x < 0)
+         sprintf(b,".%ld",x);
+      else
+         sprintf(b,".+%ld",x);
+      }
+
+   return (b);
+
+}/* * * * * * * * * * * END OF lookup() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This function  translates an 8088  addressing mode byte *
+  * to an equivalent assembler string,  returning a pointer *
+  * thereto.  If necessary,  it performs  successive inputs *
+  * of bytes from the object file in order to obtain offset *
+  * data,  adjusting PC  accordingly.  (The addressing mode *
+  * byte  appears in several  8088  opcodes;  it is used to *
+  * specify source and destination operand locations.)  The *
+  * third  argument to the function is zero if the standard *
+  * registers are to be used,  or eight if the segment reg- *
+  * isters are to be used; these constants are defined sym- *
+  * bolically in dis.h.  NOTE:  The mtrans()  function must *
+  * NEVER be called except  immediately  after fetching the *
+  * mode byte.  If any additional  object bytes are fetched *
+  * after  the fetch of the mode  byte,  mtrans()  will not *
+  * produce correct output!                                 *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+char *
+mtrans(c,m,type)
+
+   register int c;            /* Primary instruction byte   */
+   register int m;            /* Addressing mode byte       */
+
+   int type;                  /* Type code: standard or seg */
+
+{/* * * * * * * * * *  START OF mtrans()  * * * * * * * * * */
+
+   unsigned long pc;
+   int offset, oflag, dir, w, mod, reg, rm;
+   static char a[100];
+   static char b[30];
+
+   offset = 0;
+   dir = c & 2;
+   w = c & 1;
+   mod = (m & 0xc0) >> 6;
+   reg = (m & 0x38) >> 3;
+   rm = m & 7;
+   pc = PC + 1;
+
+   if (type)
+      w = 1;
+
+   if ((oflag = mod) > 2)
+      oflag = 0;
+
+   if (oflag)
+      {
+      int j, k;
+      if (oflag == 2)
+         {
+         FETCH(j);
+         FETCH(k);
+         offset = (k << 8) | j;
+         }
+      else
+         {
+         FETCH(j);
+         if (j & 0x80)
+            k = 0xff00;
+         else
+            k = 0;
+         offset = k | j;
+         }
+      }
+
+   if (dir)
+      {
+      strcpy(a,REGS[type + ((w << 3) | reg)]);
+      strcat(a,",");
+      switch (mod)
+         {
+         case 0 :
+            if (rm == 6)
+               {
+               int j, k;
+               FETCH(j);
+               FETCH(k);
+               offset = (k << 8) | j;
+               strcat(a,
+                lookup((long)(offset),N_DATA,LOOK_ABS,pc));
+               }
+            else
+               {
+               sprintf(b,"(%s)",REGS0[rm]);
+               strcat(a,b);
+               }
+            break;
+         case 1 :
+         case 2 :
+            if (mod == 1)
+               strcat(a,"*");
+            else
+               strcat(a,"#");
+            sprintf(b,"%d(",offset);
+            strcat(a,b);
+            strcat(a,REGS1[rm]);
+            strcat(a,")");
+            break;
+         case 3 :
+            strcat(a,REGS[(w << 3) | rm]);
+            break;
+         }
+      }
+   else
+      {
+      switch (mod)
+         {
+         case 0 :
+            if (rm == 6)
+               {
+               int j, k;
+               FETCH(j);
+               FETCH(k);
+               offset = (k << 8) | j;
+               strcpy(a,
+                lookup((long)(offset),N_DATA,LOOK_ABS,pc));
+               }
+            else
+               {
+               sprintf(b,"(%s)",REGS0[rm]);
+               strcpy(a,b);
+               }
+            break;
+         case 1 :
+         case 2 :
+            if (mod == 1)
+               strcpy(a,"*");
+            else
+               strcpy(a,"#");
+            sprintf(b,"%d(",offset);
+            strcat(a,b);
+            strcat(a,REGS1[rm]);
+            strcat(a,")");
+            break;
+         case 3 :
+            strcpy(a,REGS[(w << 3) | rm]);
+            break;
+         }
+      strcat(a,",");
+      strcat(a,REGS[type + ((w << 3) | reg)]);
+      }
+
+   return (a);
+
+}/* * * * * * * * * * * END OF mtrans() * * * * * * * * * * */
+
+ /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+  *                                                         *
+  * This simple routine  truncates a string returned by the *
+  * mtrans() function, removing its source operand. This is *
+  * useful in handlers which ignore the "reg"  field of the *
+  * mode byte.                                              *
+  *                                                         *
+  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void
+mtrunc(a)
+
+   register char *a;          /* Ptr. to string to truncate */
+
+{/* * * * * * * * * *  START OF mtrunc()  * * * * * * * * * */
+
+   register int k;
+
+   for (k = strlen(a) - 1; k >= 0; --k)
+      if (a[k] == ',')
+         {
+         a[k] = '\0';
+         break;
+         }
+
+}/* * * * * * * * * * * END OF mtrunc() * * * * * * * * * * */
+
+
diff --git a/dis88/old_a.out.h b/dis88/old_a.out.h
new file mode 100644
index 0000000..1a36dfb
--- /dev/null
+++ b/dis88/old_a.out.h
@@ -0,0 +1,117 @@
+/* The <a.out> header file describes the format of executable files. */
+
+#ifndef _AOUT_H
+#define _AOUT_H
+
+struct	exec {			/* a.out header */
+  unsigned char	a_magic[2];	/* magic number */
+  unsigned char	a_flags;	/* flags, see below */
+  unsigned char	a_cpu;		/* cpu id */
+  unsigned char	a_hdrlen;	/* length of header */
+  unsigned char	a_unused;	/* reserved for future use */
+  unsigned short a_version;	/* version stamp (not used at present) */
+  long		a_text;		/* size of text segement in bytes */
+  long		a_data;		/* size of data segment in bytes */
+  long		a_bss;		/* size of bss segment in bytes */
+  long		a_entry;	/* entry point */
+  long		a_total;	/* total memory allocated */
+  long		a_syms;		/* size of symbol table */
+
+  /* SHORT FORM ENDS HERE */
+  long		a_trsize;	/* text relocation size */
+  long		a_drsize;	/* data relocation size */
+  long		a_tbase;	/* text relocation base */
+  long		a_dbase;	/* data relocation base */
+};
+
+#define A_MAGIC0      (unsigned char) 0x01
+#define A_MAGIC1      (unsigned char) 0x03
+#define BADMAG(X)     ((X).a_magic[0] != A_MAGIC0 ||(X).a_magic[1] != A_MAGIC1)
+
+/* CPU Id of TARGET machine (byte order coded in low order two bits) */
+#define A_NONE	0x00	/* unknown */
+#define A_I8086	0x04	/* intel i8086/8088 */
+#define A_M68K	0x0B	/* motorola m68000 */
+#define A_NS16K	0x0C	/* national semiconductor 16032 */
+#define A_I80386 0x10	/* intel i80386 */
+#define A_SPARC	0x17	/* Sun SPARC */
+
+#define A_BLR(cputype)	((cputype&0x01)!=0) /* TRUE if bytes left-to-right */
+#define A_WLR(cputype)	((cputype&0x02)!=0) /* TRUE if words left-to-right */
+
+/* Flags. */
+#define A_UZP	0x01	/* unmapped zero page (pages) */
+#define A_PAL	0x02	/* page aligned executable */
+#define A_NSYM	0x04	/* new style symbol table */
+#define A_EXEC	0x10	/* executable */
+#define A_SEP	0x20	/* separate I/D */
+#define A_PURE	0x40	/* pure text */		/* not used */
+#define A_TOVLY	0x80	/* text overlay */	/* not used */
+
+/* Offsets of various things. */
+#define A_MINHDR	32
+#define	A_TEXTPOS(X)	((long)(X).a_hdrlen)
+#define A_DATAPOS(X)	(A_TEXTPOS(X) + (X).a_text)
+#define	A_HASRELS(X)	((X).a_hdrlen > (unsigned char) A_MINHDR)
+#define A_HASEXT(X)	((X).a_hdrlen > (unsigned char) (A_MINHDR +  8))
+#define A_HASLNS(X)	((X).a_hdrlen > (unsigned char) (A_MINHDR + 16))
+#define A_HASTOFF(X)	((X).a_hdrlen > (unsigned char) (A_MINHDR + 24))
+#define A_TRELPOS(X)	(A_DATAPOS(X) + (X).a_data)
+#define A_DRELPOS(X)	(A_TRELPOS(X) + (X).a_trsize)
+#define A_SYMPOS(X)	(A_TRELPOS(X) + (A_HASRELS(X) ? \
+  			((X).a_trsize + (X).a_drsize) : 0))
+
+struct reloc {
+  long r_vaddr;			/* virtual address of reference */
+  unsigned short r_symndx;	/* internal segnum or extern symbol num */
+  unsigned short r_type;	/* relocation type */
+};
+
+/* r_tyep values: */
+#define R_ABBS		0
+#define R_RELLBYTE	2
+#define R_PCRBYTE	3
+#define R_RELWORD	4
+#define R_PCRWORD	5
+#define R_RELLONG	6
+#define R_PCRLONG	7
+#define R_REL3BYTE	8
+#define R_KBRANCHE	9
+
+/* r_symndx for internal segments */
+#define S_ABS		((unsigned short)-1)
+#define S_TEXT		((unsigned short)-2)
+#define S_DATA		((unsigned short)-3)
+#define S_BSS		((unsigned short)-4)
+
+struct nlist {			/* symbol table entry */
+  char n_name[8];		/* symbol name */
+  long n_value;			/* value */
+  unsigned char	n_sclass;	/* storage class */
+  unsigned char	n_numaux;	/* number of auxiliary entries (not used) */
+  unsigned short n_type;	/* language base and derived type (not used) */
+};
+
+/* Low bits of storage class (section). */
+#define	N_SECT		  07	/* section mask */
+#define N_UNDF		  00	/* undefined */
+#define N_ABS		  01	/* absolute */
+#define N_TEXT		  02	/* text */
+#define N_DATA		  03	/* data */
+#define	N_BSS		  04	/* bss */
+#define N_COMM		  05	/* (common) */
+
+/* High bits of storage class. */
+#define N_CLASS		0370	/* storage class mask */
+#define C_NULL
+#define C_EXT		0020	/* external symbol */
+#define C_STAT		0030	/* static */
+
+/* Function prototypes. */
+#ifndef _ANSI_H
+#include "ansi.h"
+#endif
+
+_PROTOTYPE( int nlist, (char *_file, struct nlist *_nl)			);
+
+#endif /* _AOUT_H */