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| en:docs:dos:api:int21:0e [2020/12/07 08:56] – created prokushev | en:docs:dos:api:int21:0e [2024/05/11 06:17] (current) – prokushev | ||
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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 ===== | ||