Z80 PIO

A Z80 PIO (parallel input/output, in Zilog terms) is an interface IC that adds two programmable parallel ports to a Z80-based system, reducing CPU overhead for parallel I/O, handshaking, and interrupt-driven transfers. An IC in the Z0842884PSC class belongs to the Zilog Z80 PIO family and provides two independent 8-bit ports, port A and port B,...