Here is what is new in version 1.2 of this Sega Master System emulator:
- Proper emulation of the Game Gear parallel and serial I/O hardware.
- Codemasters mapper support.
- PAL console support.
- Improved memory management. (Space Gun works)
- New SN76489 PSG emulator from Maxim.
- New YM2413 FM emulator from MAME. EMU2413 is still available too.
- Fixes to the rendering engine.
- Support for the SMS 2 VDP extended display modes.
- Many improvements to the VDP and I/O port management.
- Tons of bugfixes and other minor improvements.