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A screenshot of the Atari emulator Stella’s debugger.

I’ve been playing with a bit of 6502 and z80 assembly programming. I don’t plan to make anything substantial, but I’ve been learning a lot and having fun.

I love a system that I can hold in my head.

Can you spot the bug here? It took me ages to find, but there’s a classic here! Off by one! I needed to flip the decrement and setting bits of the loop so that it didn’t skip the last memory address while clearing memory.