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GearSystem Git (2026/03/28) is a C++ emulator for Sega Master System and Game Gear, compatible with iOS, Raspberry Pi, Mac, Windows, and Linux. It emphasizes source code readability and offers high compatibility. Key features include an accurate Z80 core, multi-mapper support, external RAM with save files, automatic region detection, SMS2 224 mode support, an internal ROM detection database, SDL Audio sound emulation, and a real-time disassembler. The latest changelog includes various bug fixes and improvements related to memory management and mapper functions. GearSystem supports compressed ROMs and is available for download.
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GearSystem Git (2026/03/28) has been compiled. GearSystem is an emulator for Sega Master System / Game Gear, developed in C++. It supports iOS, Raspberry Pi, Mac, Windows, and Linux. This emulator prioritizes source code readability while maintaining high compatibility.
Features:
– Precise Z80 core.
– Multi-Mapper support: SEGA, Codemasters, and ROM-only cartridges.
– Save file support with external RAM.
– Automatic region detection for NTSC-JAP, NTSC-USA, and PAL-EUR.
– 224 mode support for SMS2 only.
– Internal database for ROM detection.
– Sound emulation via SDL Audio and Sms_Snd_Emu library.
– Built-in disassembler that can dump the entire disassembled memory to a text file or allow real-time access.
– Compressed ROM support (ZIP deflate).
– Cross-platform: Works on Windows, Linux, Mac OS X, Raspberry Pi, and iOS.
GearSystem Git changelog:
* Revert SDL_GetBasePath and SDL_free calls
* [mcp] Enhanced agent skills
* Respect enabled flag in retro_cheat_set call
* Correct flash erase that always presumed slot 2 in Iratahack mapper
* Fix incorrect pointer returned by Codemasters mapper GetPage
* Add a missing 16-bit shift in Pow2Ceil rounding
* Release SDL_GetBasePath memory to avoid leaks
* Prevent unsigned underflow in strncat_fit size calculation
