via http://www.aep-emu.de/

PiCiJi has updated his Sega Master System, Game Gear and SG-1000 emulator TwoMbit with cycle accurate emulation.

Quote:
v 1.0.3
- [feature] added mac support
- [feature] added linux support
- [feature] added correct aspect switch
- [bugfix] scanlines in higher resolutions were displayed too thin
- [bugfix] better autodetection of pal games (the ones, which makes problems in a ntsc region).