Category: <b>no classification</b>
<br>Flags: Undocumented function<p>
<pre><b>INT 2F - IBM ROM-DOS v4.0 - INSTALLATION CHECK</b>

	AX = 1980h
Return: AL = FFh if ??? installed/supported
Note:	called at the very beginning of SHELLSTB.COM, which exits if AL is not
	  FFh on return
SeeAlso: AX=1981h,AX=1982h
</pre>