GearSystem is a Sega Master System / Game Gear emulator written in C++ that runs on iOS, Raspberry Pi, Mac, Windows and Linux. The main focus of this emulator is readability of source code with very high compatibility.


Features:
- Highly accurate Z80 core.
- Multi-Mapper support: SEGA, Codemasters, and ROM only cartridges.
- External RAM support with save files.
- Automatic region detection: NTSC-JAP, NTSC-USA, PAL-EUR.
- SMS2 only 224 mode support.
- Internal database for rom detection.
- Sound emulation using SDL Audio and Sms_Snd_Emu library.
- Integrated disassembler. It can dump the full disassembled memory to a text file or access it in real time.
- Compressed rom support (ZIP deflate).
- Multi platform. Runs on Windows, Linux, Mac OS X, Raspberry Pi and iOS.

GearSystem changelog:

Windows, Linux, macOS and Raspberry Pi 4:
Full Debugger for Master System, Game Gear and SG-1000.
Z80 disassembler with breakpoints and debug symbols.
TMS9918 inspector, including pattern tables, name tables, sprites and palettes.
Memory Editor.
Open rom using cli argument.
Libretro:
Emulation parameters like region, system, mapper, etc.
All platforms:
Load gamepad mappings from file.
Several bug fixes.


https://github.com/drhelius/Gearsystem/releases

http://www.emulation64.com/view/3070...v310-released/