Seen before. It was a kit offered in the late 80s by some long-gone kit
maker. They might have been sold at Heathkit or Lafayette stores, who often
carried assembled consumer devices and third-party kits. I seem to recall
it used fuse-programmed PROM chips as decoders. It's a very rare item.
Cannot be googled.
I seem to recall that using proms as decoders was somewhat common at the
time. I know I’ve seen other projects using that same idea. Maybe proms
were cheaper than dedicated decoder chips or provided the ability to create
custom patterns?
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