74LS04 - quick question pleease

Maybe I should just hook up an LED to every pin of every chip and go from there? :)

Doubtful you would be able to perceive the state changes on the leds even at the amazingly slow cpu clock running running at 755khz. If you have a logic probe or frequency counter you'd be able to at least tell if you are dealing with a solid high, low or have a signal.
 
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