Function 53h "Used Internally by DOS" - Translate BPB
* Translates BPB (BIOS Parameter Block, see below) into a DOS Disk
Block (see function call 32h).
entry AH 53h
DS:SI pointer to BPB
ES:BP pointer to area for DOS Disk Block.
Layout of Disk Block:
00h-01h bytes per sector, get from DDB bytes 02h-03h.
02h sectors per cluster, get from (DDB byte 4) + 1
03h-04h reserved sectors, get from DDB bytes 06h-07h
05h number of FATs, get from DDB byte 08h
06h-07h number of root dir entries, get from DDB bytes 09h-0Ah
08h-09h total number of sectors, get from:
((DDB bytes 0Dh-0Eh) - 1) * (sectors per cluster (BPB
byte 2)) + (DDB bytes 0Bh-0Ch)
0Ah media descriptor byte, get from DDB byte 16h
0Bh-0Ch number of sectors per FAT, get from DDB byte 0Fh
|file: /Techref/INT/21f/53.htm, 1KB, , updated: 1999/2/20 10:26, local time: 2023/11/30 13:26,
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