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AH = 1Fh
Return:
AL = status 00h successful DS:BX -> Drive Parameter Block (DPB) (see #01357 for DOS 1.x, AH=32h for DOS 2+) FFh invalid drive
Note: This call was undocumented prior to the release of DOS 5.0; however, only the DOS 4.0+ version of the DPB has been documented
Format of DOS 1.1 and MS-DOS 1.25 drive parameter block: Offset Size Description (Table 01357) 00h BYTE sequential device ID 01h BYTE logical drive number (0=A:) 02h WORD bytes per sector 04h BYTE highest sector number within a cluster 05h BYTE shift count to convert clusters into sectors 06h WORD starting sector number of first FAT 08h BYTE number of copies of FAT 09h WORD number of directory entries 0Bh WORD number of first data sector 0Dh WORD highest cluster number (number of data clusters + 1) 0Fh BYTE sectors per FAT 10h WORD starting sector of directory 12h WORD address of allocation table
Note: The DOS 1.0 table is the same except that the first and last fields are missing; see INT 21/AH=32h for the DOS 2+ version
See Also: #01395 - #04039
Category: DOS Kernel - Int 21h - D
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