> You could use a serial to parallel to light your displays

I have an example here, on my much-neglected ;-(( site

(where oh where does the time go ?)

http://home.clear.net.nz/pages/joecolquitt/2wireled.html

> then a parallel to serial to read your switches

I've used a 4051 to read opto-interrupters, he work good,
and a 74HC251 to serialise data from an EPROM, he work
good also too

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