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===== Input ===== | ===== Input ===== | ||
- | | + | * AH = 0Eh |
- | DL = new default drive (00h = A:, 01h = B:, etc) | + | |
===== Return ===== | ===== Return ===== | ||
- | AL = number of potentially valid drive letters | + | * AL = number of potentially valid drive letters |
===== Notes ===== | ===== Notes ===== | ||
- | under Novell NetWare, the return value is always 32, the number of drives that NetWare supports | + | 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 | + | 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 | + | 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 | + | 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 | + | "parse FCB" (see AH=[[en: |
===== See also ===== | ===== See also ===== | ||
- | AH=19h,AH=3Bh,AH=DBh | + | AH=[[en: |
===== Note ===== | ===== Note ===== |