gba: improve BIOS open bus edge case handling

ares-emulator / ares

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gba: improve BIOS open bus edge case handling #1504

Closed png183 closed 1 month ago

png183 commented 1 month ago

This PR improves handling of BIOS open bus edge cases that previously were handled incorrectly, such as unaligned 8-bit and 16-bit accesses, and cases where the last value read from BIOS was not a 32-bit value.