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oldlinux-files/docs/interrupts/int-html/rb-0673.htm
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<TITLE>Int 13/AH=23h
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Int 13/AH=23h - HARD DISK - PS/1 and newer PS/2 - SET CONTROLLER FEATURES REGISTER -
AH = 23h
AL = feature number (see #00266)
DL = drive number (80h,81h)
???
Return: CF clear if successful
CF set on error
AH = status (see #00234 at AH=01h)
SeeAlso: AH=21hPS/1,AH=22hPS/1,AH=24hPS/1,AH=25hPS/1
(Table 00266)
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<h2>Int 13/AH=23h
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<h3><font color=#C00040>HARD DISK - PS/1 and newer PS/2 - SET CONTROLLER FEATURES REGISTER</font></h3>
<PRE>
AH = 23h
AL = feature number <a href="rb-0673.htm#Table266" tppabs="http://www.ctyme.com/intr/rb-0673.htm#Table266">(see #00266)</a>
DL = drive number (80h,81h)
???<br>
<p><b>Return:</b><br>CF clear if successful
CF set on error
AH = status <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #00234 at AH=01h)
</PRE>
<p><b>See Also:</b>
<a href="rb-0669.htm" tppabs="http://www.ctyme.com/intr/rb-0669.htm">AH=21h"PS/1"</a> - <a href="rb-0669.htm" tppabs="http://www.ctyme.com/intr/rb-0669.htm">AH=22h"PS/1"</a> - <a href="rb-0669.htm" tppabs="http://www.ctyme.com/intr/rb-0669.htm">AH=24h"PS/1"</a> - <a href="rb-0669.htm" tppabs="http://www.ctyme.com/intr/rb-0669.htm">AH=25h"PS/1"</a>
<PRE>
<p>
<a name=table266></a>
(Table 00266)
Values for PS/1 hard disk feature number:
01h select 8-bit data transfers instead of 16-bit
02h enable write cache
22h Write Same, user-specified area
33h disable retries
44h set number of ECC bytes for read long/write long (see AH=0Ah,AH=0Bh)
54h set cache segments
55h disable lookahead
66h disable reverting to power-on defaults
77h disable error correctioni
81h select 16-bit data transfers (default)
82h disable write cache
88h enable error correction (default)
99h enable retries (default)
AAh enable lookahead
BBh set ECC length for read long/write long to four bytes
CCh enable reverting to power-on defaults
DDh Write Same, entire disk
</PRE>
<p><b>See Also:</b>
#P0535
<p>
<b>Category: <a href="cat-008.htm" tppabs="http://www.ctyme.com/intr/cat-008.htm">
Disk I/O Enhancements</a>
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Int 13h</a>
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