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NanoBoyAdvance is a cycle-accurate Game Boy Advance emulator that prioritizes precision and correctness in replicating original hardware behavior. It is designed to emulate the GBA at a very low level, including CPU timing, DMA operations, graphics processing, and memory behavior, ensuring that even edge cases and obscure hardware quirks are faithfully reproduced. The emulator achieves extremely high compatibility, passing multiple hardware test suites and accurately running games that rely on precise timing conditions. In addition to accuracy, it introduces enhancements such as a high-quality audio mixer that improves sound output without altering internal emulation behavior. ...

...Some existing emulators are very accurate (Gambatte, BGB >= 1.5) but are not documented very clearly, so they are not that good references for emulator developers. I want this project to document as clearly as possible why certain behavior is emulated in a certain way. This also means writing a lot of test ROMs to figure out corner cases and precise behavior on real hardware. The emulator is lagging behind hardware research. I don't want to spend time making short-lived and probably incorrect fixes to the emulator if I'm not sure about the hardware behavior. On an i7-3770K desktop machine, I can usually run ROMs with 2000 - 4000% speed. ...