Int 1E  - System Data - Diskette Parameters                                [B]


Notes: the default parameter table (see #0960) is located at F000h:EFC7h for
     100% compatible BIOSes
   if the table is changed, INT 13/AH=00h should be called to ensure that
     the floppy-disk controller is appropriately reprogrammed

See Also: INT 13/AH=0Fh,INT 41"HARD DISK 0",INT 4D/AH=0Ah

Format of diskette parameter table:
Offset Size    Description (Table 0960)
 00h   BYTE    first specify byte
       bits 7-4: step rate (Fh=2ms,Eh=4ms,Dh=6ms,etc.)
       bits 3-0: head unload time (0Fh = 240 ms)
 01h   BYTE    second specify byte
       bits 7-1: head load time (01h = 4 ms)
       bit    0: non-DMA mode (always 0)
 02h   BYTE    delay until motor turned off (in clock ticks)
 03h   BYTE    bytes per sector (00h = 128, 01h = 256, 02h = 512, 03h = 1024)
 04h   BYTE    sectors per track
 05h   BYTE    length of gap between sectors (2Ah for 5.25", 1Bh for 3.5")
 06h   BYTE    data length (ignored if bytes-per-sector field nonzero)
 07h   BYTE    gap length when formatting (50h for 5.25", 6Ch for 3.5")
 08h   BYTE    format filler byte (default F6h)
 09h   BYTE    head settle time in milliseconds
 0Ah   BYTE    motor start time in 1/8 seconds
---IBM SurePath BIOS---
 0Bh   BYTE    maximum track number
 0Ch   BYTE    data transfer rate
 0Dh   BYTE    drive type in CMOS

See Also: #2897 at INT 4D/AH=09h