Solving Advent of Code with a ZX Spectrum (2022, Part 1: days 1 to 5)

This is the intro to what will hopefully be a series where I solve all 25 days of Advent of Code 2022 using only a 48k Sinclair ZX Spectrum. You can find all the code for my solutions on github here: https://github.com/lexbailey/AoC2022/