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4-bit virtual CPU
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ToyCPU-4bit/MISTAKES.md

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Mistakes

Don't design opcodes in your head

You WILL frick up and your binary encodings WILL overlap. You definitely need some tool to design instruction opcodes for anything more complicated than just 1-byte instructions.

Load/store instructions MUST be able to use register as address

I have no idea how we didn't notice this mistake. I guess it is not too bad for a CPU with 16 bytes of memory, but for something bigger it is unacceptable.