[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)
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INT 13H 18H: Set Media Type for Format