An old bipolar PROM would work too...  82S123, 74288, something like that
wuld do quite nicely, not sure about how easy to find they may be though.
But a simple PAL or GAL would certainly do it.

Dale
--
"Curiosity is the very basis of education and if you tell me that
curiosity killed the cat, I say only the cat died nobly."
          - Arnold Edinborough

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