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oldlinux-files/docs/interrupts/int-html/rb-2934.htm
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<TITLE>Int 21/AH=48h
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Int 21/AH=48h - DOS 2+ - ALLOCATE MEMORY -
AH = 48h
BX = number of paragraphs to allocate
Return: CF clear if successful
AX = segment of allocated block
CF set on error
AX = error code (07h,08h) (see #01680 at AH=59h/BX=0000h)
BX = size of largest available block
Notes: DOS 2.1-6.0 coalesces free blocks while scanning for a block to
allocate
.COM programs are initially allocated the largest available memory
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<h2>Int 21/AH=48h
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<h3><font color=#C00040>DOS 2+ - ALLOCATE MEMORY</font></h3>
<PRE>
AH = 48h
BX = number of paragraphs to allocate<br>
<p><b>Return:</b><br>CF clear if successful
AX = segment of allocated block
CF set on error
AX = error code (07h,08h) <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 #01680 at AH=59h/BX=0000h)
BX = size of largest available block
</PRE>
<p><b>Notes:</b>
DOS 2.1-6.0 coalesces free blocks while scanning for a block to
allocate.
.COM programs are initially allocated the largest available memory
block, and should free some memory with AH=49h before attempting any
allocations.
Under the FlashTek X-32 DOS extender, EBX contains a protected-mode
near pointer to the allocated block on a successful return
<p><b>See Also:</b>
<a href="rb-2935.htm" tppabs="http://www.ctyme.com/intr/rb-2935.htm">AH=49h</a> - <a href="rb-2936.htm" tppabs="http://www.ctyme.com/intr/rb-2936.htm">AH=4Ah</a> - <a href="rb-3008.htm" tppabs="http://www.ctyme.com/intr/rb-3008.htm">AH=58h</a> - <a href="rb-3243.htm" tppabs="http://www.ctyme.com/intr/rb-3243.htm">AH=83h</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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