If you never did these operations, 0x00..=0x38 were usable as general purpose RAM
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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 didn't enable interrupts this free real estate went all the way up to 0xFF
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What does "printf("%d",NULL);" say? Did they pick a non-zero NULL pointer constant?
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I should have said address 0 instead of null, nobody used anything other than assembly on the gameboy
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Correction: It's part of ROM, not RAM, but the optimization would still apply and you can still read from it
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