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oldlinux-files/docs/interrupts/int-html/rb-2723.htm
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<TITLE>Int 21/AH=31h
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Int 21/AH=31h - DOS 2+ - TERMINATE AND STAY RESIDENT -
AH = 31h
AL = return code
DX = number of paragraphs to keep resident
Return: never
Notes: the value in DX only affects the memory block containing the PSP;
additional memory allocated via AH=48h is not affected
the minimum number of paragraphs which will remain resident is 11h
for DOS 2.x and 06h for DOS 3.0+
most TSRs can save some memory by releasing their environment block
before terminating (see #01378 at AH=26h,AH=49h)
">
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<h2>Int 21/AH=31h
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<h3><font color=#C00040>DOS 2+ - TERMINATE AND STAY RESIDENT</font></h3>
<PRE>
AH = 31h
AL = return code
DX = number of paragraphs to keep resident<br>
<p><b>Return:</b><br>Never
</PRE>
<p><b>Notes:</b>
The value in DX only affects the memory block containing the PSP;
additional memory allocated via AH=48h is not affected.
The minimum number of paragraphs which will remain resident is 11h
for DOS 2.x and 06h for DOS 3.0+.
Most TSRs can save some memory by releasing their environment block
before terminating <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 #01378 at AH=26h,AH=49h).
Any open files remain open, so one should close any files which will
not be used before going resident; to access a file which is left
open from the TSR, one must switch PSP segments first (see AH=50h)
<p><b>See Also:</b>
<a href="rb-2551.htm" tppabs="http://www.ctyme.com/intr/rb-2551.htm">AH=00h</a> - <a href="rb-2974.htm" tppabs="http://www.ctyme.com/intr/rb-2974.htm">AH=4Ch</a> - <a href="rb-2976.htm" tppabs="http://www.ctyme.com/intr/rb-2976.htm">AH=4Dh</a> - <a href="rb-2470.htm" tppabs="http://www.ctyme.com/intr/rb-2470.htm">INT 20</a> - <a href
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<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>
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D</a>
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