Hey @nanochess.bsky.social, I was curious about this bit in your chapter 3 exercises. It looks and reads like an error and doesn't change anything if deleted but was curious if I was missing something.
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It isn't an error, it checks the locations of two different labels to see if both are in the same 256-byte page. Because 6502 takes an extra cycle to jump between pages, something that we cannot afford with the strict TIA timing.
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Many thanks for the time you took to reply.