174 lines
11 KiB
HTML
174 lines
11 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 21/AH=91h/CX=FFFFh
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 21/AH=91h/CX=FFFFh - PTS-DOS 6.51 & S/DOS 1.0 - DIRECT DISK WRITE -
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AH = 91h
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CX = FFFFh (for partitions 32 Mb)
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DS:BX - request block (see #04094)
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CX = sector count (for partitions 32 Mb)
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DX = starting sector number
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DS:BX - buffer
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Return: CF set on error
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AX error code
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CF clear on success
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Note: This function is supported by Paragon Technology Systems S/DOS 1.0
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">
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<META NAME="robots" CONTENT="none">
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</HEAD>
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<BODY BGCOLOR="#FFD0A0">
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<center>
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<h2>Int 21/AH=91h/CX=FFFFh
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</h2>
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</center><p>
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<table border=1 cellpadding=3 cellspacing=1>
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<td>
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<a href="javascript:if(confirm('http://www.ctyme.com/rbrown.htm \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/rbrown.htm'" tppabs="http://www.ctyme.com/rbrown.htm">
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<td><a href="cat.htm" tppabs="http://www.ctyme.com/intr/cat.htm">Categories</a></td>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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</td></table><p>
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<p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<h3><font color=#C00040>PTS-DOS 6.51 & S/DOS 1.0 - DIRECT DISK WRITE</font></h3>
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<PRE>
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AH = 91h
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CX = FFFFh (for partitions > 32 Mb)
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DS:BX -> request block <a href="rb-3262.htm#Table4094" tppabs="http://www.ctyme.com/intr/rb-3262.htm#Table4094">(see #04094)</a>
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CX = sector count (for partitions < 32 Mb)
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DX = starting sector number
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DS:BX -> buffer<br>
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<p><b>Return:</b><br>CF set on error
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AX error code
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CF clear on success
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</PRE>
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<p><b>Note:</b>
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This function is supported by Paragon Technology Systems S/DOS 1.0
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(and most probably by PTS-DOS 6.51, maybe even earlier)..
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To access big partitions (> 32 Mb), CX != FFFFh is not allowed and
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the buffer must always be used. Otherwise, the system will return
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error code 0207h..
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It is currently unknown if this function is also supported by
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PhysTechSoft PTS-DOS 6.60, 6.70, or 2000.
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<p><b>See Also:</b>
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<a href="rb-2584.htm" tppabs="http://www.ctyme.com/intr/rb-2584.htm">INT 21/Ah=90h"PTS"</a> - INT 25h - INT 26h
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<p>
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<b>Category: <a href="cat-043.htm" tppabs="http://www.ctyme.com/intr/cat-043.htm">
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Uncatagorized</a>
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- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
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Int 21h</a>
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- <a href="alpha-p.htm" tppabs="http://www.ctyme.com/intr/alpha-p.htm">
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P</a>
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</b><p><p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<img src="lup.gif" tppabs="http://graphics.ctyme.com/gif/lup.gif" border=0 alt=Prev></a>
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<img src="ldown.gif" tppabs="http://graphics.ctyme.com/gif/ldown.gif" border=0 alt=Next></a>
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<a href="javascript:if(confirm('http://www.ctyme.com/rbrown.htm \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/rbrown.htm'" tppabs="http://www.ctyme.com/rbrown.htm">
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<img src="lhome.gif" tppabs="http://graphics.ctyme.com/gif/lhome.gif" border=0 alt=Ralf Brown Page></a>
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<td><a href="int.htm" tppabs="http://www.ctyme.com/intr/int.htm">Interrups</a></td>
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<td><a href="cat.htm" tppabs="http://www.ctyme.com/intr/cat.htm">Categories</a></td>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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</td></table><p>
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<FORM ACTION="http://service.bfast.com/bfast/click" target="_blank">
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<INPUT TYPE="hidden" NAME="bfmid" VALUE="27253343" >
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