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gbdev / pandocs

The single, most comprehensive Game Boy technical reference.
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Weird ROM sizes #557

Open GPHemsley opened 4 months ago

GPHemsley commented 4 months ago

(Related to #106 and #108)

I don't know much about the implementation of anything, but the patterns in the "weird" ROM sizes don't seem that weird to me mathematically:

$05 + $02 -> $52 : 1 MiB + 128 KiB : 64 + 8 banks $05 + $03 -> $53 : 1 MiB + 256 KiB : 64 + 16 banks $05 + $04 -> $54 : 1 MiB + 512 KiB : 64 + 32 banks

nitro2k01 commented 4 months ago

Sure, but that information was removed because it's seemingly disconnected from reality. No one has managed to find any ROMs, official or unofficial, that use those values as they're described there. No one has managed to find any Nintendo documentation mentioning it. No one knows how the banks would be mapped in a hypothetical cartridge using those settings. No one even know who added it to the original Pan Docs back in the day and why. For all intents and purposes it's bogus information.

Edit: it apparently wasn't actually removed.