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oldlinux-files/docs/interrupts/int-html/rb-2598.htm
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2024-02-19 00:23:35 -05:00

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<TITLE>Int 21/AH=21h
</TITLE>
<META NAME="Description" CONTENT="
Int 21/AH=21h - DOS 1+ - READ RANDOM RECORD FROM FCB FILE -
AH = 21h
DS:DX - opened FCB (see #01345)
Return: AL = status
00h successful
01h end of file, no data read
02h segment wrap in DTA, no data read
03h end of file, partial record read
Disk Tranfer Area filled with record read from file
Notes: the record is read from the current file position as specified by the
random record and record size fields of the FCB
">
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<h2>Int 21/AH=21h
</h2>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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<h3><font color=#C00040>DOS 1+ - READ RANDOM RECORD FROM FCB FILE</font></h3>
<PRE>
AH = 21h
DS:DX -> opened FCB <a href="rb-2574.htm#Table1345" tppabs="http://www.ctyme.com/intr/rb-2574.htm#Table1345">(see #01345)</a><br>
<p><b>Return:</b><br>AL = status
00h successful
01h end of file, no data read
02h segment wrap in DTA, no data read
03h end of file, partial record read
Disk Tranfer Area filled with record read from file
</PRE>
<p><b>Notes:</b>
The record is read from the current file position as specified by the
random record and record size fields of the FCB.
The file position is not updated after reading the record.
If a partial record is read, it is zero-padded to the full size.
Not supported by MS Windows 3.0 DOSX.EXE DOS extender
<p><b>See Also:</b>
<a href="rb-2579.htm" tppabs="http://www.ctyme.com/intr/rb-2579.htm">AH=14h</a> - <a href="rb-2599.htm" tppabs="http://www.ctyme.com/intr/rb-2599.htm">AH=22h</a> - <a href="rb-2683.htm" tppabs="http://www.ctyme.com/intr/rb-2683.htm">AH=27h</a> - <a href="rb-2783.htm" tppabs="http://www.ctyme.com/intr/rb-2783.htm">AH=3Fh"DOS"</a>
<p>
<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
DOS Kernel</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
- <a href="alpha-d.htm" tppabs="http://www.ctyme.com/intr/alpha-d.htm">
D</a>
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