Parallel I/O ports for the IBM microchannel
Charles D. Spencer, E. J. Herrmann · Computers in Physics · 1991
Eight-bit parallel input/output (I/O) ports for the IBM microchannel are described. First, the microchannel signals needed for the ports are identified and defined. Next, the states of the data and address lines and the controls during input and output sequences are described. Finally, ports circuitry which responds to the sequences is presented and explained.