Parallel port adapter for IBM PCs
The PC Printer Port Interface presented here allows a significant number of data latches, or ports to be controlled from a single PC parallel / printer port. Standard and bidirectional ports are supported. Enhanced ports are not required. Fully expanded, and with 8 bit latches connected to each sub-address, it is possible to address 1024 individual 1 bit lines, for turning on or off lights, motors or whatever.
   Parallel port adapter for IBM PCs
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