Good day all! I was trying to understand how the keyboard signaled the controller processor that a new key was punched but to no avail. Also, the shift reg. (U2) notes which keys are pushed but I can't see how this works. The inputs of U2 are pulled up with external 100k r's but the input of U2 being a 'hc device loads the input circuitry very very little and so the input would never go to a low logic level. I take it that until the processor is some how notified that a key is pushed, it remains in sleep mode. Hard for me to understand without some help but I'm sure, you guys have the answers. Thanks for any encouragement, Bob K7HBG
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