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Thread: debugging tool
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> LCD interface wants too many pins

KPL, attached is an unusual multiplexing idea that you might find
useful if you have a keypad and LCD. I tried it briefly, seems to
work OK. Basically, two functions. Clock the 4040 and check the
i/p for a high that corresponds to the Q value, or clock the 4040
to the nybble data for the LCD. RS could be Q6, saves a pin,
takes a little more time


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