Digital output extender module with multiplexer

A common problem, at least for me, when using I/O devices is running out of ports. When I was using the parallel I/O device in my rack box project, I ran out of outputs. I solved that by making this output extender. It’s quite simple; it uses a multiplexer circuit to multiplex (duh) 3 outputs and turn them into 7. It does have some limitations though…

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