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GearSystem Git (2026/04/14) is an emulator for Sega Master System and Game Gear, developed in C++. It runs on multiple platforms, including iOS, Raspberry Pi, Mac, Windows, and Linux, with an emphasis on source code readability and high compatibility. Key features include a highly accurate Z80 core, multi-mapper support, automatic region detection, external RAM support, sound emulation, and an integrated disassembler. Recent updates fixed various debug and audio issues. The emulator supports compressed ROMs and has an internal database for ROM detection. Download GearSystem Git for your preferred platform.
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GearSystem Git (2026/04/14) has been compiled. GearSystem is a Sega Master System / Game Gear emulator developed in C++ that is compatible with iOS, Raspberry Pi, Mac, Windows, and Linux. This emulator emphasizes the readability of its source code while maintaining excellent compatibility.
Features:
– Highly precise Z80 core.
– Support for multiple mappers: SEGA, Codemasters, and ROM-only cartridges.
– External RAM capability with save file support.
– Automatic region detection: NTSC-JAP, NTSC-USA, PAL-EUR.
– Support for SMS2 exclusive 224 mode.
– Internal database for ROM identification.
– Sound emulation through SDL Audio and Sms_Snd_Emu library.
– Built-in disassembler that can dump the entire disassembled memory to a text file or access it in real-time.
– Compressed ROM support (ZIP deflate).
– Multi-platform compatibility, running on Windows, Linux, Mac OS X, Raspberry Pi, and iOS.
GearSystem Git changelog:
* Fixed debug bank reporting that ignored the active game slot
* Fixed debug ROM page and bank reporting for 4PAK mapper
* Fixed debug ROM page mapping for MSX mapper
* Fixed debug ROM page mapping for Janggun mapper
* Fixed audio buffer out-of-bounds read on empty frames
