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In case this helps, there is an IC called '1-of-8 data selector', 74LS151.
Also called '8-line to 1-line multiplexer'.
Apply a 3-bit address, and the output indicates the state of the corresponding input, high or low.
You would need ten of these, to scan 80 inputs one at a time, in succession. Maybe additional IC's too, since you'd need to build a branching network.
Also called '8-line to 1-line multiplexer'.
Apply a 3-bit address, and the output indicates the state of the corresponding input, high or low.
You would need ten of these, to scan 80 inputs one at a time, in succession. Maybe additional IC's too, since you'd need to build a branching network.