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Gearboy Git (2026/05/19) is a Nintendo Game Boy emulator written in C++, prioritizing code readability while ensuring strong compatibility. Key features include accurate CPU and memory timing, various Memory Bank Controllers, and precise LCD controller emulation, including effects like ghosting. It supports sound emulation via SDL Audio and includes Game Boy Color compatibility. Additional functionalities encompass an integrated disassembler, save state options, and support for Game Genie and GameShark cheats. Gearboy runs on multiple platforms, including Windows, Linux, macOS, Raspberry Pi, and iOS, and functions as a libretro core for RetroArch. Recent updates include log trace removal and window focus improvements.
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Gearboy Git (2026/05/19) has been compiled. Gearboy is a Game Boy emulator for Nintendo, developed in C++. While the focus is on the readability of the source code, it still achieves good compatibility. Significant effort has gone into following OOP principles while maintaining simplicity.
Features of Gearboy:
– Highly precise CPU emulation, successfully passing cpu_instrs.gb from blargg’s tests.
– Accurate timing for instructions and memory, passing instr_timing.gb and mem_timing.gb from blargg’s tests.
– Support for Memory Bank Controllers (MBC1, MBC2, MBC3 with RTC, MBC5), as well as ROM + RAM and multicart cartridges.
– Realistic emulation of the LCD controller. This includes background, window, and sprite rendering with correct timing and priority settings, including mid-scanline timing.
– Frame mixing: Replicates the LCD ghosting effect found in the original Game Boy.
– Sound emulation powered by SDL Audio and the Gb_Snd_Emu library.
– Compatibility with Game Boy Color.
– Built-in disassembler that can output the entire disassembled memory to a text file or access it in real-time.
– Allows saving of battery-backed RAM cartridges to file.
– Save state functionality.
– Support for compressed ROMs (ZIP deflate).
– Game Genie and GameShark cheat support.
– Cross-platform compatibility. Runs on Windows, Linux, Mac OS X, Raspberry Pi, iOS, and as a libretro core (RetroArch).
Changelog for Gearboy Git:
* Removed incorrect log trace.
* App window now focuses after desktop startup.
