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https://gbdev.gg8.se/wiki/articles/Memory_Bank_Controllers#MBC2_.28max_256KByte_ROM_and_512x4_bits_RAM.29 According to that there is a bit in the address you're using that is also relevant. "The least significant bit of the upper address byte must be one to select a ROM bank." - The address needs OR'ing with 0x0100. Try writing to 0x2100->0x21ff as ...


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Games have "sets" (AKA versions). The software changes but not the hardware. For instance Pengo set 2 is harder than set 1 and has a different music (to avoid lawsuits?) If you can "mod" an existing game, then ignore the checksums, you could run your own game. You would have messages like: g8x_p6.bin WRONG CHECKSUMS: EXPECTED: CRC(7e3471d3) SHA1(...


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