[AT] Expects: AH 18H CH maximum number of tracks CL maximum sectors per track 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. See Also: DOS fn 440dH 40H (IOCTL set device parms) INT 13H: BIOS Disk I/O BIOS Data Area ROM-BIOS Functions -♦-