Same here - writing code in assembly, on paper, then looking up the opcodes in the back of the orange manual. Having to write out the bytes and using DATA to s

Same here - writing code in assembly, on paper, then looking up the opcodes in the back of the orange manual. Having to write out the bytes and using DATA to store them, and POKE to put them in-memory. Calculating the JMP offsets by hand, and taking the time to SAVE to cassette before running it for the first time. I didn't write much assembly, but I spent a hell of a long time removing protection from Spectrum games, and patching the code to give me infinite lives/time.