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AH = 0Eh DL = new default drive (00h = A:, 01h = B:, etc)
Return:
AL = number of potentially valid drive letters
Notes: Under Novell NetWare, the return value is always 32, the number of drives that NetWare supports. Under DOS 3.0+, the return value is the greatest of 5, the value of LASTDRIVE= in CONFIG.SYS, and the number of drives actually present. On a DOS 1.x/2.x single-floppy system, AL returns 2 since the floppy
may be accessed as either A:
Or B:. Otherwise, the return value is the highest drive actually present. DOS 1.x supports a maximum of 16 drives, 2.x a maximum of 63 drives, and 3+ a maximum of 26 drives. Under Novell DOS 7, this function returns the correct LASTDRIVE value even when the undocumented LASTDRIVE=27..32 directive was used in CONFIG.SYS. "parse FCB" (see AH=29h) can be used to determine whether a drive letter is valid
See Also: AH=19h - AH=3Bh - AH=DBh
Category: DOS Kernel - Int 21h - D
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