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<TITLE>Int 13/AH=41h/BX=55AAh
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Int 13/AH=41h/BX=55AAh - IBM/MS INT 13 Extensions - INSTALLATION CHECK -
AH = 41h
BX = 55AAh
DL = drive (80h-FFh)
Return: CF set on error (extensions not supported)
AH = 01h (invalid function)
CF clear if successful
BX = AA55h if installed
AH = major version of extensions
01h = 1.x
20h = 2.0 / EDD-1.0
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<h2>Int 13/AH=41h/BX=55AAh
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<h3><font color=#C00040>IBM/MS INT 13 Extensions - INSTALLATION CHECK</font></h3>
<PRE>
AH = 41h
BX = 55AAh
DL = drive (80h-FFh)<br>
<p><b>Return:</b><br>CF set on error (extensions not supported)
AH = 01h (invalid function)
CF clear if successful
BX = AA55h if installed
AH = major version of extensions
01h = 1.x
20h = 2.0 / EDD-1.0
21h = 2.1 / EDD-1.1
30h = EDD-3.0
AL = internal use
CX = API subset support bitmap <a href="rb-0706.htm#Table271" tppabs="http://www.ctyme.com/intr/rb-0706.htm#Table271">(see #00271)</a>
DH = extension version (v2.0+ ??? -- not present in 1.x)
</PRE>
<p><b>Note:</b>
The Phoenix Enhanced Disk Drive Specification v1.0 uses version 2.0 of
the INT 13 Extensions API
<p><b>See Also:</b>
<a href="rb-0706.htm" tppabs="http://www.ctyme.com/intr/rb-0706.htm">AH=42h"INT 13 Ext"</a> - <a href="rb-0706.htm" tppabs="http://www.ctyme.com/intr/rb-0706.htm">AH=48h"INT 13 Ext"</a>
<PRE>
<p>
Bitfields for IBM/MS INT 13 Extensions API support bitmap:
<a name=table271></a>
Bit(s) Description (Table 00271)
0 extended disk access functions (AH=42h-44h,47h,48h) supported
1 removable drive controller functions (AH=45h,46h,48h,49h,INT 15/AH=52h)
supported
2 enhanced disk drive (EDD) functions (AH=48h,AH=4Eh) supported.
Extended drive parameter table is valid <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 #00273,#00278)
3-15 reserved (0)
</PRE>
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<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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