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oldlinux-files/docs/interrupts/int-html/rb-0708.htm
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<TITLE>Int 13/AH=42h
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Int 13/AH=42h - IBM/MS INT 13 Extensions - EXTENDED READ -
AH = 42h
DL = drive number
DS:SI - disk address packet (see #00272)
Return: CF clear if successful
AH = 00h
CF set on error
AH = error code (see #00234)
disk address packet's block count field set to number of blocks
successfully transferred
SeeAlso: AH=02h,AH=41hINT 13 Ext,AH=43hINT 13 Ext
">
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<h2>Int 13/AH=42h
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<h3><font color=#C00040>IBM/MS INT 13 Extensions - EXTENDED READ</font></h3>
<PRE>
AH = 42h
DL = drive number
DS:SI -> disk address packet <a href="rb-0708.htm#Table272" tppabs="http://www.ctyme.com/intr/rb-0708.htm#Table272">(see #00272)</a><br>
<p><b>Return:</b><br>CF clear if successful
AH = 00h
CF set on error
AH = error code <a href="rb-0606.htm#Table234" tppabs="http://www.ctyme.com/intr/rb-0606.htm#Table234">(see #00234)</a>
disk address packet's block count field set to number of blocks
successfully transferred
</PRE>
<p><b>See Also:</b>
<a href="rb-0607.htm" tppabs="http://www.ctyme.com/intr/rb-0607.htm">AH=02h</a> - <a href="rb-0706.htm" tppabs="http://www.ctyme.com/intr/rb-0706.htm">AH=41h"INT 13 Ext"</a> - <a href="rb-0706.htm" tppabs="http://www.ctyme.com/intr/rb-0706.htm">AH=43h"INT 13 Ext"</a>
<PRE>
<p>
Format of disk address packet:
<a name=table272></a>
Offset Size Description (Table 00272)
00h BYTE size of packet (10h or 18h)
01h BYTE reserved (0)
02h WORD number of blocks to transfer (max 007Fh for Phoenix EDD)
04h DWORD -> transfer buffer
08h QWORD starting absolute block number
(for non-LBA devices, compute as
(Cylinder*NumHeads + SelectedHead) * SectorPerTrack +
SelectedSector - 1
10h QWORD (EDD-3.0, optional) 64-bit flat address of transfer buffer;
used if DWORD at 04h is FFFFh:FFFFh
</PRE>
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Disk I/O Enhancements</a>
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Int 13h</a>
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