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oldlinux-files/docs/interrupts/int-html/rb-0717.htm
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<TITLE>Int 13/AH=4Ah
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<META NAME="Description" CONTENT="
Int 13/AH=4Ah - Bootable CD-ROM - INITIATE DISK EMULATION -
AH = 4Ah
AL = 00h
DS:SI - specification packet (see #00281)
Return: CF clear if successful
CF set on error (drive will not be in emulation mode)
AX = return codes
SeeAlso: AH=48h,AX=4B00h,AH=4Ch,AH=4Dh
Format of Bootable CD-ROM Specification Packet:
Offset Size Description (Table 00281)
">
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<h2>Int 13/AH=4Ah
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<h3><font color=#C00040>Bootable CD-ROM - INITIATE DISK EMULATION</font></h3>
<PRE>
AH = 4Ah
AL = 00h
DS:SI -> specification packet <a href="rb-0717.htm#Table281" tppabs="http://www.ctyme.com/intr/rb-0717.htm#Table281">(see #00281)</a><br>
<p><b>Return:</b><br>CF clear if successful
CF set on error (drive will not be in emulation mode)
AX = return codes
</PRE>
<p><b>See Also:</b>
<a href="rb-0715.htm" tppabs="http://www.ctyme.com/intr/rb-0715.htm">AH=48h</a> - <a href="rb-0718.htm" tppabs="http://www.ctyme.com/intr/rb-0718.htm">AX=4B00h</a> - <a href="rb-0720.htm" tppabs="http://www.ctyme.com/intr/rb-0720.htm">AH=4Ch</a> - AH=4Dh
<PRE>
<p>
Format of Bootable CD-ROM Specification Packet:
<a name=table281></a>
Offset Size Description (Table 00281)
00h BYTE size of packet in bytes (13h)
01h BYTE boot media type <a href="rb-0717.htm#Table282" tppabs="http://www.ctyme.com/intr/rb-0717.htm#Table282">(see #00282)</a>
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)
<p><b>(IDE) bit 0:</b><br>Drive is slave instead of master
<p><b>(SCSI) bits 7-0:</b><br>LUN and PUN
<p><b>bits 15-8:</b><br>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)
</PRE>
<p><b>See Also:</b>
#00283 - <a href="rb-0621.htm" tppabs="http://www.ctyme.com/intr/rb-0621.htm">AH=08h</a>
<PRE>
<p>
Bitfields for Bootable CD-ROM boot media type:
<a name=table282></a>
Bit(s) Description (Table 00282)
3-0 media type.
0000 no emulation.
0001 1.2M diskette.
0010 1.44M diskette.
0011 2.88M diskette.
0100 hard disk (drive C:).
Other reserved
5-4 reserved (0)
6 image contains ATAPI driver
7 image contains SCSI driver(s)
</PRE>
<p><b>See Also:</b>
#00281
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