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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:

bytes value

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

return unknown

file: /Techref/INT/21f/53.htm, 1KB, , updated: 1999/2/20 10:26, local time: 2024/2/25 21:05,

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