Used but in very nice condition.

The PC-DIO-24/PnP is a low cost, 24-bit, parallel digital I/O interface for ISA computers. An OKI 82C55A programmable peripheral interface (PPI) chip controls the 24 bits of digital I/O. The 82C55A chip is very flexible and powerful when interfacing with peripheral equipment, can operate in either a unidirectional or bidirectional bus mode, and can generate interrupt requests to the host computer. You can program the 82C55A chip for numerous 8-bit, 16-bit, or 24-bit digital I/O applications. All digital I/O communication is through a standard 50-pin male connector. The pin assignments for this connector are compatible with standard 24-channel digital I/O applications.