"Paul B. Webster VK2BZC" wrote:
>
> Hello Tony.
>
> > Maybe a 74C150 16 line to 1 line multiplexer.
>
>   Now how would you use that?
>

I could be wrong (it's been a long day) but I thought you could set a 4
bit code to sample any one of the 16 inputs. There are inverted, but
that doesn't matter. If a key is pressed on the input line that
corresponds to the 4 bit data, then the output state will be opposite of
the key state. 6 lines from a PIC including the strobe.

--
Best regards

Tony

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