Int 6B Fn 12 - Npc Ncsi Extended Serial I/o - Virtual Circuit Status [S]
AH = 12h
AL = virtual circuit number
CL = ???
ES:BX -> ???
Return: ???
Note: this function is also supported by TelAPI
See Also: AH=10h,AH=15h,AH=1Ah,AH=1Bh,AH=1Fh
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