MasterGear v4.5 for Windows is released. MasterGear is a program that emulates 8bit SEGA videogames on your computer. It runs games made for SEGA MasterSystem (Mark3 in Japan) and GameGear, as well as their predecessors: SG1000, SC3000, SF7000, and Mark2. MasterGear will also help hobbyists who still write software for these systems to debug their works without using rare and costly development hardware.

MasterGear v4.5 for Windows Changelog:
Now truncating all VRAM table addresses to 16kB boundary.
Fixed accidental crashes when running SC-3000 programs.
Now only hitting MIDI drums once per screen when recording.
Moved "Light Gun" option to the "Input" menu in MG-Windows.

Download: MasterGear v4.5 for Windows
Source: Here