On to Day 9 in the Z80 Advent of Code solution series, continuing the recent trend of adapting code written in 2022 but now with more exhaustive descriptions.

Day 8 has a somewhat less obvious puzzle than the previous days, but as is typical with the Z80 solutions there’s still more time spent working against the low level nature of assembly than there is time spent figuring out how to solve the puzzle.

Original photo by HarshLight (cropped)

Day 7 is a challenge primarily about parsing the input, with a little side-trip into a recursive algorithm and a dab of 32-bit arithmetic on an 8-bit processor.

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