A known ZSNES emulator bug breaks barrel rotation control in Donkey Kong Country 2.
The game uses an open bus read (and $2000) instead of an immediate value, relying on SNES hardware to return 0x2020.
Without open bus emulation, ZSNES’s AND always yields zero, so barrels spin endlessly.
Replacing the opcode with an immediate AND (#$2000) in the ROM fixes the barrel rotation behavior.
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