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Gearboy Git (2026/04/03) is a C++ Nintendo Game Boy emulator emphasizing readability and good compatibility. It features highly accurate CPU, instruction, and memory timing emulation, with support for various Memory Bank Controllers (MBC1, MBC2, MBC3 with RTC, MBC5). It mimics the original Game Boy’s LCD ghosting effect and offers sound emulation via SDL Audio. Additional capabilities include Game Boy Color support, an integrated disassembler, save states, cheat support (Game Genie and GameShark), and compatibility across multiple platforms (Windows, Linux, Mac OS X, Raspberry Pi, iOS, and as a libretro core). The latest update includes bounds checking for the TraceLogger.
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Gearboy Git (2026/04/03) has been compiled. Gearboy is a Nintendo Game Boy emulator developed in C++. It emphasizes source code readability while maintaining strong compatibility. A significant effort has been made to adhere to OOP principles while keeping the codebase as straightforward as possible.
Gearboy Features:
– Highly precise CPU emulation, successfully passing cpu_instrs.gb from blargg’s tests.
– Exact instruction and memory timing, passing instr_timing.gb and mem_timing.gb from blargg’s tests.
– Support for Memory Bank Controllers (MBC1, MBC2, MBC3 with RTC, MBC5), ROM + RAM, and multicart cartridges.
– Accurate emulation of the LCD controller. Background, window, and sprites feature correct timings and priorities, including mid-scanline timing.
– Frame mixing: Simulates the LCD ghosting effect observed in the original Game Boy.
– Sound emulation via SDL Audio and the Gb_Snd_Emu library.
– Game Boy Color compatibility.
– Built-in disassembler that can export full disassembled memory to a text file or access it in real time.
– Ability to save battery-powered RAM cartridges to file.
– Save states.
– Supports compressed ROM formats (ZIP deflate).
– Game Genie and GameShark cheat code support.
– Cross-platform compatibility. Runs on Windows, Linux, macOS, Raspberry Pi, iOS, and as a libretro core (RetroArch).
Gearboy Git Changelog:
* Added bounds check to TraceLogger GetEntry
