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All is well again

Like when there are no prints, and you have to tug every wire to see where it goes. Then scribble something on a piece of cardboard so you can remember what is what.........
And The Craftsman said "what are wire markers and ty-wraps?".

On one such occasion it was actually quicker to gut it and rewire the damn thing rather than troubleshoot.
 

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Or you didn't terminate your lines...

Just so some people know, the CMOS/MOS gating functions do not run any sort of termination.

So selection of the logic input impedance - it is set by the boards own I/O termination resistor - per line - if any is used.

Nowadays, with the proliferation of so many clones and copycats, the subjective effort to "Tune" the input and output to sync with a ringing effect to augment the clocking drivers back then in the TTL to what we use today - that art of echo and termination - seems to have been lost.
 
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