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Format of Bootable CD-ROM Specification Packet

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Offset Size Description

00h

BYTE

size of packet in bytes (13h)

01h

BYTE

boot media type (see #00282)

02h

BYTE

drive number
00h - floppy image
80h - bootable hard disk
81h-FFh - nonbootable or no emulation

03h

BYTE

CD-ROM controller number

04h

DWORD

Logical Block Address of disk image to emulate

08h

WORD

device specification (see also #00282)
(IDE) bit 0 : drive is slave instead of master
(SCSI) bits 7-0 : LUN and PUN
bits 15-8 : bus number

0Ah

WORD

segment of 3K buffer for caching CD-ROM reads

0Ch

WORD

load segment for initial boot image (if 0000h, load at segment 07C0h)

0Eh

WORD

number of 512-byte virtual sectors to load (only valid for AH=4Ch)

10h

BYTE

low byte of cylinder count (for INT 13/AH=08h)

11h

BYTE

sector count, high bits of cylinder count (for INT 13/AH=08h)

12h

BYTE

head count (for INT 13/AH=08h)

See Also:

#00283,AH=08h