Anodized aluminum. The boards were zilco Z80 series processors and all the controller equipment for traffic lights. Basically what was required in 1984 that today would fit inside a stamp. Traffic Control Technologies LC8000s, 42 of those and LC80s 6 of those. A Zilco Z80 is a hell of a unit, 10Mhz processor with a draw of less than 2 watts and back then it required 8 megs of memory which meant those two big finger cards with black and yellow ICs, were 4MB memory cards, or 16 64KB chips and 4 EPROMS. The other cards were coprocessors and more EPROMS and then one solid state control card for outputs.
A forewarning, break down was ALL flat head screws of three different sizes, you have to deal with disposal of EXTRAlytic caps. I've got the connectors and caps still, a guy is coming to get the caps tomorrow (Friday) and I havent figured out who's getting the connectors.
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