I repeated the process again. I instructed the documentation gathering session very accurately about the kind of details I wanted it to search on the internet, especially the ULA interactions with RAM access, the keyboard mapping, the I/O port, how the cassette tape worked and the kind of PWM encoding used, and how it was encoded into TAP or TZX files.
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They all organize data by location so you can skip irrelevant regions, replacing "check everything" with "check the things that could possibly matter." That's what took us from a million comparisons to ten.