Category: <b>serial I/O</b>
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<pre><b>INT 6B - NPC NCSI EXTENDED SERIAL I/O - SET/RETRIEVE SERVICE ADDRESS</b>

	AH = 14h
	AL = virtual circuit number
	ES:BX -&gt; buffer for/containing service address
Return: ???
Note:	this function is also supported by TelAPI, which only supports
	  retrieving the address
SeeAlso: AH=13h,AH=15h,AH=21h
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