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1. Tube🌞Time (tubetime@mastodon.social)'s status on Wednesday, 28-Aug-2024 01:56:09 JST Tube🌞Time

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   this later revision of the st-251 uses a mask-ROM microcontroller. it's very similar to the R6518, at least in the pinout. it also latches its internal address bus on a bunch of the pins during the rising edge of phi2! this means i can spy on the program counter and any other memory addresses being accessed.