Category: <b>DOS extenders</b>
<br>Flags: available only in protected mode<p>
<pre><b>INT 21 - Phar Lap 386/DOS-Extender v3.0+ - INSTALL MOD. SEG FAILURE HANDLER</b>

	AX = 253Ah
	ES:EBX -&gt; function to be called when INT 21/AH=4Ah is about to return
		an error
Return: CF clear
	ES:EBX -&gt; previous handler
SeeAlso: AH=4Ah
</pre>