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@kaia this reminds me of the behavior of my weird hacked together Nixie clock that uses a long cascade of 7490 counters, when you first plug it in, it will come up with some strange invalid mess until you rapid-advance it. It's a limitation of the way the reset to 0 and gates are wired back to the outputs; it will trigger a reset when the 10 minutes digit tries to count to 6, for instance, but it can wind up in some other impossible states without tripping it