169 lines
11 KiB
HTML
169 lines
11 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 21/AH=49h
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 21/AH=49h - DOS 2+ - FREE MEMORY -
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AH = 49h
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ES = segment of block to free
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Return: CF clear if successful
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CF set on error
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AX = error code (07h,09h) (see #01680 at AH=59h/BX=0000h)
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Notes: apparently never returns an error 07h, despite official docs; DOS 2.1+
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code contains only an error 09h exit
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DOS 2.1-6.0 does not coalesce adjacent free blocks when a block is
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freed, only when a block is allocated or resized
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the code for this function is identical in DOS 2.1-6.0 except for
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">
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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=49h
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</h2>
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</center><p>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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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>DOS 2+ - FREE MEMORY</font></h3>
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<PRE>
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AH = 49h
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ES = segment of block to free<br>
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<p><b>Return:</b><br>CF clear if successful
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CF set on error
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AX = error code (07h,09h) <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)
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</PRE>
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<p><b>Notes:</b>
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Apparently never returns an error 07h, despite official docs; DOS 2.1+
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code contains only an error 09h exit.
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DOS 2.1-6.0 does not coalesce adjacent free blocks when a block is
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freed, only when a block is allocated or resized.
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The code for this function is identical in DOS 2.1-6.0 except for
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calls to start/end a critical section in DOS 3.0+
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<p><b>See Also:</b>
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<a href="rb-2934.htm" tppabs="http://www.ctyme.com/intr/rb-2934.htm">AH=48h</a> - <a href="rb-2936.htm" tppabs="http://www.ctyme.com/intr/rb-2936.htm">AH=4Ah</a>
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<p>
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<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
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DOS Kernel</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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D</a>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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