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# Mistakes
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## Don't design opcodes in your head
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You WILL frick up and your binary encodings WILL overlap.
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You definitely need some tool to design instruction opcodes
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for anything more complicated than just 1-byte instructions.
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## Load/store instructions MUST be able to use register as address
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I have no idea how we didn't notice this mistake.
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I guess it is not too bad for a CPU with 16 bytes of memory,
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but for something bigger it is unacceptable.
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