Table of Contents:

• Introduction
• Settings Reference

Mednafen's Sega Genesis/Megadrive emulation is based off of Genesis Plus.

Caution: Any settings that change emulation behavior as seen from the emulated game are shown with the setting name bolded in the table. One should be conscious of these settings if one has changed them from the default values when using network play or movies, as they can cause desychronizations if not set the same among hosts(or between the recording emulator and the playing emulator).

Setting:	Value Type:	Possible Values:	Default Value:	Description:
md.cdbios	string		us_scd1_9210.bin	Path to the CD BIOS SegaCD/MegaCD emulation is currently nonfunctional.
md.correct_aspect	boolean	0 1	1	Correct the aspect ratio.
md.input.port1	enum	none gamepad2 gamepad gamepad6 megamouse	gamepad	Input device for Port 1 none - none gamepad2 - 2-Button Gamepad gamepad - 3-Button Gamepad gamepad6 - 6-Button Gamepad megamouse - Sega Mega Mouse
md.input.port2	enum	none gamepad2 gamepad gamepad6 megamouse	gamepad	Input device for Port 2 none - none gamepad2 - 2-Button Gamepad gamepad - 3-Button Gamepad gamepad6 - 6-Button Gamepad megamouse - Sega Mega Mouse
md.region	enum	game overseas_ntsc overseas_pal domestic_ntsc domestic_pal	game	Emulate the specified region's Genesis/MegaDrive game - Match game's header. Emulate the region that the game indicates it expects to run in via data in the header(or in an internal database for a few games that may have bad header data). overseas_ntsc - Overseas(non-Japan), NTSC Region used in North America. overseas_pal - Overseas(non-Japan), PAL Region used in Europe. domestic_ntsc - Domestic(Japan), NTSC Region used in Japan. domestic_pal - Domestic(Japan), PAL Probably an invalid region, but available for testing purposes anyway.
md.reported_region	enum	same game overseas_ntsc overseas_pal domestic_ntsc domestic_pal	same	Region reported to the game. same - Match the region emulated. game - Match game's header. This option, in conjunction with the "md.region" setting, can be used to run all games at NTSC speeds, or all games at PAL speeds. overseas_ntsc - Overseas(non-Japan), NTSC Region used in North America. overseas_pal - Overseas(non-Japan), PAL Region used in Europe. domestic_ntsc - Domestic(Japan), NTSC Region used in Japan. domestic_pal - Domestic(Japan), PAL Probably an invalid region, but available for testing purposes anyway.

Setting:	Value Type:	Possible Values:	Default Value:	Description:
md.debugger.disfontsize	enum		small	Disassembly font size.
md.debugger.memcharenc	string		shift_jis	Character encoding for the debugger's memory editor.
md.enable	boolean	0 1	1	Enable (automatic) usage of this module.
md.forcemono	boolean	0 1	0	Force monophonic sound output.
md.pixshader	enum	none ipxnoty ipynotx ipsharper ipxnotysharper ipynotxsharper scale2x	none	Enable specified OpenGL pixel shader. Obviously, this will only work with the OpenGL "video.driver" setting, and only on cards and OpenGL implementations that support pixel shaders, otherwise you will get a black screen, or Mednafen may display an error message when starting up. Bilinear interpolation is disabled with pixel shaders, and any interpolation, if present, will be noted in the description of each pixel shader. none - None/Disabled ipxnoty - Linear interpolation on X axis only. ipynotx - Linear interpolation on Y axis only. ipsharper - Sharper bilinear interpolation. ipxnotysharper - Sharper version of "ipxnoty". ipynotxsharper - Sharper version of "ipynotx". scale2x - Scale2x
md.scanlines	integer	0 through 100	0	Enable scanlines with specified opacity. Opacity is specified in %; IE a value of "100" will give entirely black scanlines.
md.special	enum	none hq2x hq3x hq4x scale2x scale3x scale4x 2xsai super2xsai supereagle nn2x nn3x nn4x nny2x nny3x nny4x	none	Enable specified special video scaler. The destination rectangle is NOT altered by this setting, so if you have xscale and yscale set to "2", and try to use a 3x scaling filter like hq3x, the image is not going to look that great. The nearest-neighbor scalers are intended for use with bilinear interpolation enabled, at high resolutions(such as 1280x1024; nn2x(or nny2x) + bilinear interpolation + fullscreen stretching at this resolution looks quite nice). none - None/Disabled hq2x - hq2x hq3x - hq3x hq4x - hq4x scale2x - scale2x scale3x - scale3x scale4x - scale4x 2xsai - 2xSaI super2xsai - Super 2xSaI supereagle - Super Eagle nn2x - Nearest-neighbor 2x nn3x - Nearest-neighbor 3x nn4x - Nearest-neighbor 4x nny2x - Nearest-neighbor 2x, y axis only nny3x - Nearest-neighbor 3x, y axis only nny4x - Nearest-neighbor 4x, y axis only
md.stretch	enum	0 full aspect	0	Stretch to fill screen. 0 - Disabled full - Full Full-screen stretch, disregarding aspect ratio. aspect - Aspect Preserve Full-screen stretch as far as the aspect ratio(in this sense, the equivalent xscalefs == yscalefs) can be maintained.
md.tblur	boolean	0 1	0	Enable video temporal blur(50/50 previous/current frame by default).
md.tblur.accum	boolean	0 1	0	Accumulate color data rather than discarding it.
md.tblur.accum.amount	real	0 through 100	50	Blur amount in accumulation mode, specified in percentage of accumulation buffer to mix with the current frame.
md.videoip	boolean	0 1	1	Enable bilinear interpolation.
md.xres	integer	64 through 65536	1024	Full-screen horizontal resolution.
md.xscale	real	0.01 through 256	3.000000	Scaling factor for the X axis.
md.xscalefs	real	0.01 through 256	3.200000	Scaling factor for the X axis in fullscreen mode.
md.yres	integer	64 through 65536	768	Full-screen vertical resolution.
md.yscale	real	0.01 through 256	3.000000	Scaling factor for the Y axis.
md.yscalefs	real	0.01 through 256	3.200000	Scaling factor for the Y axis in fullscreen mode.