System name:
mastersystem

Full system name:
Sega Master System

Supported file extensions:
.68k .68K .bin .BIN .bms .BMS .chd .CHD .col .COL .cue .CUE .gen .GEN .gg .GG .iso .ISO .m3u .M3U .md .MD .mdx .MDX .rom .ROM .sg .SG .sgd .SGD .smd .SMD .sms .SMS .7z .7Z .zip .ZIP

Launch command:
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\genesis_plus_gx_libretro.dll %ROM%

Alternative launch commands:
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\genesis_plus_gx_wide_libretro.dll %ROM%
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\smsplus_libretro.dll %ROM%
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\gearsystem_libretro.dll %ROM%
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\picodrive_libretro.dll %ROM%
%EMULATOR_MEDNAFEN% -force_module sms %ROM%
%EMULATOR_MESEN% --fullscreen %ROM%
%EMULATOR_ARES% --fullscreen --system "Master System" %ROM%

Platform (for scraping):
mastersystem

Theme folder:
mastersystem