INT 60 - FTP Packet Driver - EXTENDED FUNC - SET RECEIVE MODE
        AH = 14h
        BX = handle (optional for v1.10+)
        CX = mode
            01h turn off receiver
            02h receive only packets sent to this interface
            03h mode 2 plus broadcast packets
            04h mode 3 plus limited multicast packets
            05h mode 3 plus all multicast packets
            06h all packets
            07h raw mode for serial line only (v1.10+)
Return: CF set on error
           DH = error code (01h,08h) (see AX=01FFh)
        CF clear if successful