INT 7F - Alloy NTNX, MW386 - CHANNEL CONTROL - LOCK CHANNEL                     
	AH = 10h
	CL = 02h
	AL = channel number
Return: AL = status (00h-03h,0Ah,0Ch) (see #03951)
Note:	may not be invoked from within a hardware interrupt handler
SeeAlso: AH=10h/CL=03h,AH=10h/CL=06h,AH=10h/CL=08h