Writing to a null pointer on the game boy was a valid operation and there were optimizations you could do that required it
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Wait what. That part of the address space is in ROM.
Shit you're right. I interpreted "this memory may be used for any purpose" as it being RAM. My point was more that 0 was a valid pointer, and a valid optimization involved something that is UB in every language
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Yeah, it is a valid pointer, but I don't see what optimization you're referring to.
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Replacing `CALL x` with `RST 0` where 0 contains `JP x` for your most used value of x
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