Build 24 bit parallel port I/O card
This is a 24 bit I/O card designed to work with the parallel/printer port of an Amiga or PC. It uses the Intel 82C55 I/O chip to facilitate this.The device has 2 address lines, a chip select, read and write strobe. The parallel ports of the Amiga and PC have a limited (3) number of control lines, even then at different pin-outs, at least the 8 data pins line up! Remembering that the 8086 bus was multiplexed, inspired my solution, use 2 data pins with latches for the address and one control signal to control them. I then use an inverter to create /RD and /WR from another control line and the final control pin to control the chip select.
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