I am reminded of the Regitel system, a POS system from the early 1970's.  We ran 64 model 33's off of a three-or-four board Regitel mux on a Nova 800; you'd basically load a bunch of registers with the current bit for each port and it would bang them out; input was the reverse.  It was on the processor to the requisite mask-and-shift operations to get the bits to the right place.

An image of the cover of the Registel System glossy simply screams 1970's:

https://learninglab.si.edu/resources/view/4446092

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Christian Kennedy, Ph.D.
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"Mr. McKittrick, after careful consideration…"

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