INT 7C - SK-UPPS Data Link Interface API - DISABLE PROTOCOL
        AX = 0008h
        BX = protocol ID (see AX=0007h)
Return: AX = completion code (see AX=0001h)
Note:   the DLI will handle any Mbufs given to TRANSMIT FRAME (AX=0006h) as if
          they had been given to TRANSMIT FRAME RELEASE (AX=0013h).
        all multicast addresses registered for this protocol will be disabled.
        after this function returns, the protocol's Upcall routines will no
          longer be called.
SeeAlso: AX=0007h,AX=000Bh

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