Measurement Computing's CIO-DIO192 has 192 digital I/O lines, and eight 82C55 parallel-interface chips.
Each 82C55 chip controls 24 CMOS/TTL-compatible digital I/O pins. Each 24-bit group is divided into three eight-bit ports, or two 8-bit ports and two 4-bit ports. Each port is programmable for input or output.
All I/O bits are set to input mode (high impedance) on power up and reset. Locations are available for installing pull-up or pull-down resistors.
All signals pass through a 50-pin connector.
