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Copyright 1991 David Jurgens |
INT 13,18 - Set Media Type for Format (BIOS date specific)
AH = 18h
CH = lower 8 bits of number of tracks (0-1023 dec., see below)
CL = sectors per track (1-17 dec., see below)
DL = drive number (0=A:, 1=2nd floppy, 80h=drive 0, 81h=drive 1)
on return:
ES:DI = pointer to 11-byte Disk Base Table (DBT)
AH = 00h if requested combination supported
= 01h if function not available
= 0Ch if not supported or drive type unknown
= 80h if there is no media in the drive
CF = 0 if successful
= 1 if error
- valid only for XT BIOS dated after 1/10/86, AT after 11/15/86,
XT 286 and the PS/2 line
- only disk number is checked for validity
- track number is a 10 bit value taken from the 2 high order
bits of CL and the 8 bits in CH (low order 8 bits of track):
│F│E│D│C│B│A│9│8│7│6│5│4│3│2│1│0│ CX
│ │ │ │ │ │ │ │ │ │ └─┴─┴─┴─┴─┴──── sectors per track count
│ │ │ │ │ │ │ │ └─┴──────────── high order 2 bits track/cyl count
└─┴─┴─┴─┴─┴─┴─┴──────────── low order 8 bits of track/cyl count
- see INT 13,STATUS
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| Esc or Alt-X to exit |
int 13,18 |
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