1 files changed, 33 insertions, 0 deletions
diff --git a/memdisk/mstructs.h b/memdisk/mstructs.h
index b5f37225..47dffe95 100644
--- a/memdisk/mstructs.h
+++ b/memdisk/mstructs.h
@@ -110,6 +110,39 @@ struct mBFT {
     struct mdi mdi;
 } MEMDISK_PACKED_POSTFIX;
 
+/* The Disk Parameter Table may be required */
+typedef union {
+    struct hd_dpt {
+	uint16_t max_cyl;	/* Max cylinder */
+	uint8_t max_head;	/* Max head */
+	uint8_t junk1[5];	/* Obsolete junk, leave at zero */
+	uint8_t ctrl;		/* Control byte */
+	uint8_t junk2[7];	/* More obsolete junk */
+    } hd;
+    struct fd_dpt {
+	uint8_t specify1;	/* "First specify byte" */
+	uint8_t specify2;	/* "Second specify byte" */
+	uint8_t delay;		/* Delay until motor turn off */
+	uint8_t sectors;	/* Sectors/track */
+
+	uint8_t bps;		/* Bytes/sector (02h = 512) */
+	uint8_t isgap;		/* Length of intersector gap */
+	uint8_t dlen;		/* Data length (0FFh) */
+	uint8_t fgap;		/* Formatting gap */
+
+	uint8_t ffill;		/* Format fill byte */
+	uint8_t settle;		/* Head settle time (ms) */
+	uint8_t mstart;		/* Motor start time */
+	uint8_t maxtrack;	/* Maximum track number */
+
+	uint8_t rate;		/* Data transfer rate */
+	uint8_t cmos;		/* CMOS type */
+	uint8_t pad[2];
+
+	uint32_t old_fd_dpt;	/* Extension: pointer to old INT 1Eh */
+    } fd;
+} dpt_t;
+
 MEMDISK_PACKED_PREFIX
 struct patch_area {
     struct mdi mdi;