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INT 7F - Alloy NTNX, MW386 - CHANNEL CONTROL - LOCK MULTIPLE CHANNELS
        AH = 10h
        CL = 08h
        DX = maximum channel number to lock
Return: AL = status
            00h successful
            01h busy
            02h channel range error (not 00h-3Fh)
            03h invalid subfunction
Notes:  locks channels numbered 00h through the value in DX
        may not be invoked from within a hardware interrupt handler
SeeAlso: AH=10h/CL=06h,AH=10h/CL=09h
See Also: 7F10
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