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Gearboy Git (2026/04/15) is a Nintendo Game Boy emulator written in C++. It prioritizes source code readability while maintaining good compatibility and follows object-oriented programming principles. Key features include highly accurate CPU and memory timing, support for various Memory Bank Controllers, and precise LCD controller emulation. It also offers sound emulation, Game Boy Color support, an integrated disassembler, and features like save states and cheat support. Gearboy is multi-platform, compatible with Windows, Linux, Mac OS X, Raspberry Pi, and iOS. Recent updates include debugging enhancements and bug fixes in the emulator’s performance.
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Gearboy Git (2026/04/15) has been compiled. Gearboy serves as a Nintendo Game Boy emulator created in C++. Emphasizing source code readability, the emulator also maintains strong compatibility. Considerable effort has been made to adhere to OOP principles while keeping it user-friendly.
Gearboy Features:
– Highly precise CPU emulation, successfully passing cpu_instrs.gb from blargg’s tests.
– Accurate instruction and memory timing, passing instr_timing.gb and mem_timing.gb from blargg’s tests.
– Supports Memory Bank Controllers (MBC1, MBC2, MBC3 with RTC, MBC5), along with ROM + RAM and multicart cartridges.
– Faithful emulation of the LCD controller, managing backgrounds, windows, sprites, timings, and priorities, including mid-scanline timing.
– Frame mixing: Simulates the LCD ghosting effect visible in the original Game Boy.
– Sound emulation powered by SDL Audio and Gb_Snd_Emu library.
– Compatible with Game Boy Color.
– Built-in disassembler that can dump the entire disassembled memory to a text file or access it in real-time.
– Ability to save battery-powered RAM cartridges to file.
– Supports save states.
– Compressed ROM support (ZIP deflate).
– Game Genie and GameShark cheat compatibility.
– Cross-platform functionality, operating on Windows, Linux, Mac OS X, Raspberry Pi, iOS, and as a libretro core (RetroArch).
Gearboy Git Changelog:
* [debugger] Introduced cpu filter to trace logger
* Resolved output stream seek and tell issues
* Corrected the 12-hour RTC PM offset calculation
* Fixed incorrect LY write side effect behavior
* Addressed unused variable warnings in libretro builds
