diff options
Diffstat (limited to 'bootblocks/msdos.s')
| -rw-r--r-- | bootblocks/msdos.s | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/bootblocks/msdos.s b/bootblocks/msdos.s index 7f691ff..f291b6b 100644 --- a/bootblocks/msdos.s +++ b/bootblocks/msdos.s @@ -18,6 +18,12 @@ ! 3) The value of the hidden sectors field must be zero ! ! All these are true for mtools created floppies on normal PC drives. +! +! In addition this now has a compile time option for 16 bit FAT floppies +! TODO: Hard partition (dos_hidden != 0) +! Zip disks (floppy with dos_hidden != 0) +! Auto detect disk type +! !--------------------------------------------------------------------------- ORGADDR=$0500 @@ -29,12 +35,7 @@ export fatbits fatbits=12 ! Set to 12 or 16 (16 for LS-120 disks) export heads - -if fatbits =12 -heads=2 ! This can be 0,1 or 2. 0 is dynamic. -else heads=0 ! This can be 0,1 or 2. 0 is dynamic. -endif !--------------------------------------------------------------------------- ! Absolute position macro, fails if code before it is too big. @@ -90,7 +91,6 @@ cont: xor dh,dh mul dx add ax,[dos_resv] - ! Assume: dos_hidden == 0 mov di,ax ! DI is sector number of first root dir sector. @@ -160,10 +160,12 @@ linsect: linsect1: xor dx,dx linsect2: + ! Add partition offset in. if fatbits =16 - add ax,[dos_hidden] - adc dx,[dos_hidden+2] + add ax,[dos_hidden] + adc dx,[dos_hidden+2] endif + div [dos_spt] inc dx mov cl,dl ! Sector num |