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<TITLE>Int 21/AH=00h
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Int 21/AH=00h - DOS 1+ - TERMINATE PROGRAM -
AH = 00h
CS = PSP segment
Notes: Microsoft recommends using INT 21/AH=4Ch for DOS 2+
this function sets the program's return code (ERRORLEVEL) to 00h
execution continues at the address stored in INT 22 after DOS performs
whatever cleanup it needs to do (restoring the INT 22,INT 23,INT 24
vectors from the PSP assumed to be located at offset 0000h in the
segment indicated by the stack copy of CS, etc.)
if the PSP is its own parent, the process's memory is not freed; if
INT 22 additionally points into the terminating program, the
">
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<h2>Int 21/AH=00h
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<h3><font color=#C00040>DOS 1+ - TERMINATE PROGRAM</font></h3>
<PRE>
AH = 00h
CS = PSP segment
</PRE>
<p><b>Notes:</b>
Microsoft recommends using INT 21/AH=4Ch for DOS 2+.
This function sets the program's return code (ERRORLEVEL) to 00h.
Execution continues at the address stored in INT 22 after DOS performs
whatever cleanup it needs to do (restoring the INT 22,INT 23,INT 24
vectors from the PSP assumed to be located at offset 0000h in the
segment indicated by the stack copy of CS, etc.).
If the PSP is its own parent, the process's memory is not freed; if
INT 22 additionally points into the terminating program, the
process is effectively NOT terminated.
Not supported by MS Windows 3.0 DOSX.EXE DOS extender
<p><b>See Also:</b>
<a href="rb-2682.htm" tppabs="http://www.ctyme.com/intr/rb-2682.htm">AH=26h</a> - <a href="rb-2723.htm" tppabs="http://www.ctyme.com/intr/rb-2723.htm">AH=31h</a> - <a href="rb-2974.htm" tppabs="http://www.ctyme.com/intr/rb-2974.htm">AH=4Ch</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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