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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If you never did these operations, 0x00..=0x38 were usable as general purpose RAM
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If you didn't enable interrupts this free real estate went all the way up to 0xFF
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Wait what. That part of the address space is in ROM.
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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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