d75b7320ea
MemoryReader::read8 reads the CPU bus, where banks 1 and up are whichever bank the cartridge last switched to, so a table in another bank could only be read by writing the mapper register -- and the joypad is the only write this workspace makes into a running game. read_rom takes a bank and a CPU address and reads the cartridge image the process already holds instead. Defaulted to None, so every reader without a cartridge behind it narrows rather than guesses. |
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