MONOCHROME DISPLAY ADAPTER - ASSY # 12-10066-XX There are no switches to set on the monochrome display adapter card. The parallel printer port address is fixed at 3BC Hex. PARALLEL PORT JUMPERS E1-E2 Standard Centronics interface Device at Z44 must be a 74LS240 E3-E4 Data Products interface Device at Z44 must be a 74LS244