[AT] Expects: AH 17H AL transfer rate: 00H = (reserved; don't use) 01H = 360K diskette in 360K drive 02H = 360K diskette in 1.2 MB drive 03H = 1.2 MB diskette in 1.2 MB drive 04H = 720K diskette in 720K drive DL diskette drive number: 00H thru 03H ────────────────────────────────────────────────────────────────── Returns: AH BIOS disk error code if CF is set to CY ────────────────────────────────────────────────────────────────── Info: This should be called before a format operation (INT 13H 05H) to set the controller for the correct drive speed and track-stepping option. Notes: ■ This does NOT support 1.44 MB or 2.88 MB drives. Use INT 13H 18H, since it is more flexible. See Also: INT 13H: BIOS Disk I/O BIOS Data Area ROM-BIOS Functions -♦-