General Documentation

Last updated March 8, 2014
Valid as of 0.9.33.1

Table of Contents:

Introduction
- Base Directory

CD Emulation
Security Issues
Using Mednafen
Advanced Usage
- Minimizing video/audio/input Lag
Emulation Module Documentation
- Atari Lynx [lynx]
- GameBoy (Color) [gb]
- GameBoy Advance [gba]
- Neo Geo Pocket (Color) [ngp]
- Nintendo Entertainment System/Famicom [nes]
- PC Engine (CD)/TurboGrafx 16 (CD)/SuperGrafx [pce]
- PC Engine (CD)/TurboGrafx 16 (CD)/SuperGrafx [pce_fast]
- PC-FX [pcfx]
- Sega Game Gear [gg]
- Sega Genesis/MegaDrive [md]
- Sega Master System [sms]
- Sony PlayStation [psx]
- Super Nintendo Entertainment System/Super Famicom [snes]
- Virtual Boy [vb]
- WonderSwan [wswan]
Cheat Guide
Debugger
Network Play
Credits
Licenses, Copyright Notices, and Code Credits

Introduction

This main document covers general Mednafen usage, generally regardless of which system is being emulated. Documentation covering key assignments, settings, and related information for each system emulation module is linked to in the table of contents under "Emulation Module Documentation".

The term "movie" used in this documentation refers to save-state and recorded input stream stored in a file, generally usable only in Mednafen itself.
The terms "audio/video movie", "QuickTime movie", and variations thereof refer to audio and video data recorded and stored in a file, and usable with external programs.

Base Directory

Mednafen's "base directory" is the directory under which Mednafen stores its data and looks for various auxillary data by default. If the "HOME" environment variable is set, it will be suffixed with "/.mednafen" and used as the base directory(in other words ~/.mednafen, or $HOME/.mednafen). If the "MEDNAFEN_HOME" environment variable is set, it will be used as the base directory. If neither the "HOME" nor "MEDNAFEN_HOME" environment variable is set, and the current user has an entry in the password file, the corresponding home directory will be used as if it were the "HOME" environment variable.

On Microsoft Windows, these conditions are typically not met, in which case the directory the Mednafen executable("mednafen.exe") is in will be used as the base directory.

If none of the preceding conditions were met, then you're doomed, doomy doomy DOOMED, GOTO DOOM.

Core Features

Physical joystick/gamepad support.
Versatile input configuration system; assign multiple physical buttons to a virtual button or action.
Multiple graphics filters and scaling modes.
Save states.
Real-time game rewinding.
Screen snapshots, saved in PNG format.
QuickTime movie recording.
MS WAV-format sound logging.
Loading games from gzip and (pk)zip compressed archives.
Network play(utilizing an external dedicated server program).

CD Emulation

Mednafen can load CD-ROM games from a physical CD, or a ripped/dumped copy of the disc, such as CUE+BIN. Using a ripped copy of the disc is strongly recommended for performance and data consistency.

Physical CDs

Physical CD access is done via libcdio, using SCSI Multimedia Commands. Only drives that support reading and returning raw P-W subchannel data, CD-DA data, and 2352-byte raw data sector data are supported. Note that some drives have buggy firmware and may return subchannel data for a following or preceding sector/frame, sometimes out of order, and this can compromise or break the program being emulated.

Ripped Disc Images

For ripped disc images, Mednafen supports "CUE" sheets, CloneCD "CCD/IMG/SUB" rips, and cdrdao "TOC" files; though only a very limited subset of the latter's full capabilities is supported. Mednafen supports raw, simple storage formats supported by libsndfile(MS WAV, AIFF/AIFC, AU/SND, etc.), and Ogg Vorbis audio files referenced by CUE sheets. MP3 is not supported, and will not be supported.

The cdrdao "TOC" support in Mednafen includes support for "RW_RAW" subchannel data, needed for CD+G. Note that Mednafen assumes that the Q subchannel is also included in the RW_RAW data area in the ripped image(even though the name "RW_RAW" would suggest it isn't present, cdrdao seems to included it). If the Q subchannel data is missing from the RW_RAW data area in the ripped image, Mednafen's CD emulation will not work properly.

Since 0.8.4, Mednafen will perform simple data correction on ripped CDROM images that contain EDC and L-EC data(2352-byte-per-sector "raw" rips"). It calculates the real EDC, and if it doesn't match the EDC recorded for that sector, it will evaluate the L-EC data to repair the data. If the data is unrepairable, an error message will be displayed.
This may cause problems with naive patches that don't update the error-correction data(at least the 32-bit EDC, if that's correct, the L-EC data will be ignored)!

Enabling the cd.image_memcache option is recommended in many situations; read the setting description for more details.
CAUTION: When using a 32-bit build of Mednafen on Windows or a 32-bit operating system, Mednafen may run out of address space(and error out, possibly in the middle of emulation) if this option is enabled when loading large disc sets(e.g. 3+ discs) via M3U files.

Multiple-CD Games

To play a game that consists of more than one CD, and you are using ripped disc images, you will need to create an M3U file(plain-text, ".m3u" extension), and enter the filenames of the CUE/TOC/CCD files, one per line. Load the M3U file with Mednafen instead of the CUE/TOC/CCD files, and use the F6 and F8 keys to switch among the various discs available.
Note: Preferably, your M3U file(s) should reference CUE/TOC/CCD files that are in the same directory as the M3U file, otherwise you will likely need to alter the filesys.untrusted_fip_check setting.

Support for multi-disc games when using physical CDs is somewhat clunky. To begin with, you'll need to start Mednafen with the first disc of the set in the drive. To switch to a different disc, press the F8 key, which should eject the disc. If the disc fails to eject, use the drive's eject button, and press F8 again so that Mednafen displays a message like "Virtual CD Drive Tray Open". Place the disc you're switching to in the drive, close the lid/tray/whatever(if applicable), and press the F8 key again. If you're using a standard PC-type drive with extending tray, you may just press F8 to close the tray instead of manually closing it and then pressing F8.

CD+G

Both the PC Engine (CD) and PC-FX emulation modules support CD+G playback; however, the PC-FX BIOS doesn't appear to be as resilient when dealing with scratched discs/damaged data as the PC Engine CD BIOS is.

Note: CD+G graphics data is stored in the R-W subchannel data of discs. You must either use a physical CD with this data, or a rip that includes this data(such as in the cdrdao TOC or CloneCD formats; CUE format definitely isn't going to work).

PhotoCD Portfolio

The PC-FX emulation module supports low-resolution single-session Kodak "PhotoCD Portfolio" disc playback. Hardware features to support multi-session CDs are not fully emulated; they may or may not work.

Security Issues

This section discusses various known design flaws/choices, bugs, and limitations in Mednafen that have security implications.

Save States

Causing Mednafen to lock-up, abort, or consume large amounts of CPU time via loading a specially-constructed save state is a trivial exercise. It is hypothetically possible to overflow some buffers on some emulated systems by clever manipulation of saved timekeeping variables. In combination with custom emulated machine code and state, it may therefore be possible to run arbitrary host code, compromising the host system. Therefore, loading save states from parties you have reason to distrust, or not trust, is advised against.

CD rips and PSF(PSF1, GSF, etc.) Files

CUE and TOC, and PSF(PSF1, GSF, etc.) files can reference arbitrary files for inclusion and parsing. Inclusion of device files may cause odd system behavior, particularly if you are running Mednafen as root(which you shouldn't be!) on a UN*X system, or cause Mednafen to lockup or abort. In combination with save states, this file inclusion presents the possibility of leaking of private local information; for example, if an attacker supplies a CD rip or PSF rip that you subsequently run, and can convince you to save a state and send it back, or to connect to a network play server(in which save states are automatically utilized), the attacker may then have access to local private data from your system. The setting filesys.untrusted_fip_check, when set to 1(the default), will enable checks that mitigate this potential problem.

Network Play

Mednafen's network play automatically utilizes save states to synchronize state among newly connected players, and thereafter at connected players' command. Hence, any security issues relating to save states apply to network play as well.

Additionally, network problems, or a malicious network play server or player, may cause Mednafen to lock up or consume large amounts of CPU time processing received data.

Using Mednafen

Key Assignments

Key(s):	Action:	Configuration String:
F1	Toggle in-game quick help screen.	toggle_help
F5	Save state.	save_state
F7	Load state.	load_state
0-9	Select save state slot.	"0" through "9"
-	Decrement selected save state slot.	state_slot_dec
=	Increment selected save state slot.	state_slot_inc
ALT + S	Toggle 600-frame(~10 seconds on NES) save-state rewinding functionality, disabled by default.	state_rewind_toggle
Shift + F5	Record movie.	save_movie
Shift + F7	Play movie.	load_movie
Shift + 0-9	Select movie slot.	"m0" through "m9"
ALT + C	Toggle cheat console.	togglecheatview
ALT + T	Toggle cheats active.	togglecheatactive
T	Enable network play console input.	togglenetview
ALT + D	Toggle debugger.	toggle_debugger
Key(s):	Action:	Configuration String:
ALT + A	Enter frame advance mode, if not already in it, and advance the frame.	advance_frame
ALT + R	Exit frame advance mode.	run_normal
SHIFT + F1	Toggle frames-per-second display(from top to bottom, the display format is: virtual, rendered, blitted).	toggle_fps_view
Backspace	Rewind emulation, if save-state rewinding functionality is enabled, up to 600 frames.	state_rewind
F9	Save (rawish) screen snapshot.	take_snapshot
SHIFT + F9	Save screen snapshot, taken after all scaling and special filters/shaders are applied.	take_scaled_snapshot
ALT + O	Rotate the screen	rotate_screen
Alt + Enter	Toggle fullscreen mode.	toggle_fs
Ctrl + 1 through Ctrl + 9	Toggle layer.	"tl1" through "tl9"
`	Fast-forward.	fast_forward
\	Slow-forward.	slow_forward
Key(s):	Action:	Configuration String:
F3	Detect analog buttons on physical joysticks/gamepads(for use with the input configuration process). Twirl all sticks and D-pads and press all analog buttons on any physical gamepads/joysticks with analog buttons you want to use in the input configuration process, then press F3. Then, configure input as normal. The detected analog buttons will be recognized during input configuration until Mednafen exits; if you exit Mednafen and restart, and want to configure input devices again, you'll need to repeat the twirling-pressing-F3 process again).	input_config_abd
ALT + SHIFT + [n]	Configure buttons for emulated device on input port n(1-8).	input_confign
CTRL + SHIFT + [n]	Select input device on input port n(1-8). Note: Many games do not expect input devices to change while the game is running, and thus may require a hard reset.	device_selectn
F2	Activate in-game input configuration process for a command key.	input_configc
SHIFT + F2	Like F2, but after configuration completes, to activate the configured command key will require all buttons configured to it to be in a pressed state simultaneously to trigger the action. Note that keyboard modifier keys(CTRL, ALT, SHIFT) are still treated as modifiers and not discrete keys. Especially useful in conjunction with the ckdelay setting.	input_configc_am
Scroll Lock	Toggle input grabbing(use this to use the PC Engine mouse properly in windowed mode).	toggle_grab_input
Shift + Scroll Lock	Toggle input grabbing AND command disabling(used for giving almost unhindered button access to an emulated device; most useful when emulating the Famicom's Family Keyboard).	toggle_cdisable
Key(s):	Action:	Configuration String:
F10	Reset.	reset
F11	Hard reset(toggle power switch).	power
Escape/F12	Exit(the emulator, or netplay chat mode).	exit

Command-line

Mednafen supports options passed on the command line. Options are taken in the form of "-option value". Some options are valueless.

In addition to the options listed in the table below, any setting listed in the "Settings" section of this document and any system emulation module sub-document can be set by prefixing it with a hyphen(-), followed by the value, such as: -nes.slstart 8

Option:	Value Type:	Description:
-physcd	(n/a)	Load and boot from a physical CD. This argument modifies the usage of the filename component of the command-line, making it optional and treating it as the optical disc drive device name. Examples: mednafen -physcd mednafen -physcd /dev/sr0 mednafen -physcd \\.\E:
-force_module x	string	Force usage of specified emulation module.
-connect	(n/a)	Trigger to connect to remote host after the game is loaded.
-soundrecord x	string	Record sound output to the specified filename in the MS WAV format.
-qtrecord x	string	Record video and audio output to the specified filename in the QuickTime format.

Configuration Files

Mednafen loads/saves its settings from/to a primary configuration file, named "mednafen-09x.cfg", under the Mednafen base directory. This file is created and written to when Mednafen shuts down.

Mednafen also loads override settings from optional per-module override configuration files, also located directly under the Mednafen base directory. The general pattern for the naming of these user-created files is "<system>.cfg"; e.g. "nes.cfg", "pce.cfg", "gba.cfg", "psx.cfg", etc. This allows for overriding global settings on a per-module basis. The configuration override files will NOT be written to by Mednafen, and they will generally not alter the settings in the primary configuration file, unless a user action occurs that causes new setting values to be generated based on the current active setting value(such as toggling full-screen mode inside the emulator, for instance). Some settings currently cannot be overridden properly:

cd.image_memcache
<system>.enable

Global Settings Reference

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:
autosave	boolean	0 1	0	Automatic load/save state on game load/save. Automatically save and load save states when a game is closed or loaded, respectively.

cd.image_memcache	boolean	0 1	0	Cache entire CD images in memory. Reads the entire CD image(s) into memory at startup(which will cause a small delay). Can help obviate emulation hiccups due to emulated CD access. May cause more harm than good on low memory systems, systems with swap enabled, and/or when the disc images in question are on a fast SSD.

cheats	boolean	0 1	1	Enable cheats.

debugger.autostepmode	boolean	0 1	0	Automatically go into the debugger's step mode after a game is loaded.

ffnosound	boolean	0 1	0	Silence sound output when fast-forwarding.

ffspeed	real	1 through 15	4	Fast-forwarding speed multiplier.

fftoggle	boolean	0 1	0	Treat the fast-forward button as a toggle.

filesys.disablesavegz	boolean	0 1	0	Disable gzip compression when saving save states and backup memory.

filesys.fname_movie	string		%f.%M%p.%x	Format string for movie filename. See fname_format.txt for more information. Edit at your own risk.

filesys.fname_sav	string		%F.%M%x	Format string for save games filename. WARNING: %x should always be included, otherwise you run the risk of overwriting save data for games that create multiple save data files. See fname_format.txt for more information. Edit at your own risk.

filesys.fname_snap	string		%f-%p.%x	Format string for screen snapshot filenames. WARNING: %x or %p should always be included, otherwise there will be a conflict between the numeric counter text file and the image data file. See fname_format.txt for more information. Edit at your own risk.

filesys.fname_state	string		%f.%M%X	Format string for state filename. See fname_format.txt for more information. Edit at your own risk.

filesys.path_cheat	string		cheats	Path to directory for cheats.

filesys.path_firmware	string		firmware	Path to directory for firmware.

filesys.path_movie	string		mcm	Path to directory for movies.

filesys.path_palette	string		palettes	Path to directory for custom palettes.

filesys.path_sav	string		sav	Path to directory for save games and nonvolatile memory. WARNING: Do not set this path to a directory that contains Famicom Disk System disk images, or you will corrupt them when you load an FDS game and exit Mednafen.

filesys.path_snap	string		snaps	Path to directory for screen snapshots.

filesys.path_state	string		mcs	Path to directory for save states.

filesys.untrusted_fip_check	boolean	0 1	1	Enable untrusted file-inclusion path security check. When this setting is set to "1", the default, paths to files referenced from files like CUE sheets and PSF rips are checked for certain characters that can be used in directory traversal, and if found, loading is aborted. Set it to "0" if you want to allow constructs like absolute paths in CUE sheets, but only if you understand the security implications of doing so(see "Security Issues" section in the documentation).

input.autofirefreq	integer	0 through 1000	3	Auto-fire frequency. Auto-fire frequency = GameSystemFrameRateHz / (value + 1)

input.ckdelay	integer	0 through 99999	0	Dangerous key action delay. The length of time, in milliseconds, that a button/key corresponding to a "dangerous" command like power, reset, exit, etc. must be pressed before the command is executed.

input.joystick.axis_threshold	real	0 through 100	75	Analog axis binary press detection threshold. Threshold for detecting a digital-like "button" press on analog axis, in percent.

input.joystick.global_focus	boolean	0 1	1	Update physical joystick(s) internal state in Mednafen even when Mednafen lacks OS focus.

netplay.gamekey	string			Key to hash with the MD5 hash of the game.

netplay.host	string		netplay.fobby.net	Server hostname.

netplay.localplayers	integer	0 through 16	1	Local player count. Number of local players for network play. This number is advisory to the server, and the server may assign fewer players if the number of players requested is higher than the number of controllers currently available.

netplay.nick	string			Nickname. Nickname to use for network play chat.

netplay.password	string			Server password. Password to connect to the netplay server.

netplay.port	integer	1 through 65535	4046	Server port.

netplay.smallfont	boolean	0 1	0	Use small(tiny!) font for netplay chat console.

nothrottle	boolean	0 1	0	Disable speed throttling when sound is disabled.

osd.alpha_blend	boolean	0 1	1	Enable alpha blending for OSD elements.

osd.state_display_time	integer	0 through 15000	2000	The length of time, in milliseconds, to display the save state or the movie selector after selecting a state or movie.

qtrecord.h_double_threshold	integer	0 through 1073741824	256	Double the raw image's height if it's below this threshold.

qtrecord.vcodec	enum	raw cscd png	cscd	Video codec to use. raw - Raw A fast codec, computationally, but will cause enormous file size and may exceed your storage medium's sustained write rate. cscd - CamStudio Screen Codec A good balance between performance and compression ratio. png - PNG Has a better compression ratio than "cscd", but is much more CPU intensive. Use for compatibility with official QuickTime in cases where you have insufficient disk space for "raw".

qtrecord.w_double_threshold	integer	0 through 1073741824	384	Double the raw image's width if it's below this threshold.

sfspeed	real	0.25 through 1	0.75	SLOW-forwarding speed multiplier.

sftoggle	boolean	0 1	0	Treat the SLOW-forward button as a toggle.

sound	boolean	0 1	1	Enable sound output.

sound.buffer_time	integer	1 through 1000	32 (52 on MS Windows)	Desired total buffer size in milliseconds.

sound.device	string		default	Select sound output device. When using ALSA sound output under Linux, the "sound.device" setting "default" is Mednafen's default, IE "hw:0", not ALSA's "default". If you want to use ALSA's "default", use "sexyal-literal-default".

sound.driver	enum	default alsa oss dsound wasapi sdl jack	default	Select sound driver. The following choices are possible, sorted by preference, high to low, when "default" driver is used, but dependent on being compiled in. default - Default Default sound driver. alsa - ALSA A recommended driver, and the default for Linux(if available). oss - Open Sound System A recommended driver, and the default for non-Linux UNX/POSIX/BSD systems, or anywhere ALSA is unavailable. If the ALSA driver gives you problems, you can try using this one instead. If you are using OSSv4 or newer, you should edit "/usr/lib/oss/conf/osscore.conf", uncomment the max_intrate= line, and change the value from 100(default) to 1000(or higher if you know what you're doing), and restart OSS. Otherwise, performance will be poor, and the sound buffer size in Mednafen will be orders of magnitude larger than specified. If the sound buffer size is still excessively larger than what is specified via the "sound.buffer_time" setting, you can try setting "sound.period_time" to 2666, and as a last resort, 5333, to work around a design flaw/limitation/choice in the OSS API and OSS implementation. dsound* - DirectSound A recommended driver, and the default for Microsoft Windows. wasapi - WASAPI Experimental exclusive-mode WASAPI driver, usable on Windows Vista and newer. Use it for lower-latency sound(though you'll of course need to lower the sound.buffer_time setting to take full advantage of it). May not work properly on all sound cards. sdl - Simple Directmedia Layer This driver is not recommended, but it serves as a backup driver if the others aren't available. Its performance is generally sub-par, requiring higher latency or faster CPUs/SMP for glitch-free playback, except where the OS provides a sound callback API itself, such as with Mac OS X and BeOS. jack - JACK Somewhat experimental driver, unusably buggy until Mednafen 0.8.C. The "sound.buffer_time" setting controls the size of the local sound buffer, not the server's sound buffer, and the latency reported during startup is for the local sound buffer only. Please note that video card drivers(in the kernel or X), and hardware-accelerated OpenGL, may interfere with jackd's ability to effectively run with realtime response.

sound.period_time	integer	0 through 100000	0	Desired period size in microseconds. Currently only affects OSS, ALSA, WASAPI, and SDL output. A value of 0 defers to the default in the driver code in SexyAL. Note: This is not the "sound buffer size" setting, that would be "sound.buffer_time".

sound.rate	integer	22050 through 192000	48000	Specifies the sound playback rate, in sound frames per second("Hz").

sound.volume	integer	0 through 150	100	Sound volume level, in percent. Setting this volume control higher than the default of "100" may severely distort the sound.

srwcompressor	enum	minilzo quicklz blz	quicklz	Compressor to use with state rewinding minilzo - MiniLZO quicklz - QuickLZ blz - BLZ

srwframes	integer	10 through 99999	600	Number of frames to keep states for when state rewinding is enabled. WARNING: Setting this to a large value may cause excessive RAM usage in some circumstances, such as with games that stream large volumes of data off of CDs.

video.blit_timesync	boolean	0 1	1	Enable time synchronization(waiting) for frame blitting. Disable to reduce latency, at the cost of potentially increased video "juddering", with the maximum reduction in latency being about 1 video frame's time. Will work best with emulated systems that are not very computationally expensive to emulate, combined with running on a relatively fast CPU.

video.driver	enum	opengl sdl overlay	opengl	Video output method/driver. opengl - OpenGL + SDL This output method is preferred, as all features are available with it. sdl - SDL Surface Slower with lower-quality scaling than OpenGL, but if you don't have hardware-accelerated OpenGL rendering, it will be faster than software OpenGL rendering. Bilinear interpolation not available. Pixel shaders do not work with this output method, of course. overlay - SDL Overlay As fast as OpenGL, perhaps faster in some situations, if it's hardware-accelerated. Scanline effects are not available. hq2x, hq3x, hq4x are not available. The OSD may be missing or glitchy. Bilinear interpolation can't be turned off. Harsh chroma subsampling blurring in some picture types. If you use this output method, it is strongly recommended to use a special scaler with it, such as nn2x.

video.frameskip	boolean	0 1	1	Enable frameskip during emulation rendering. Disable for rendering code performance testing.

video.fs	boolean	0 1	0	Enable fullscreen mode.

video.glvsync	boolean	0 1	1	Attempt to synchronize OpenGL page flips to vertical retrace period. Note: Additionally, if the environment variable "__GL_SYNC_TO_VBLANK" does not exist, then it will be created and set to the value specified for this setting. This has the effect of forcibly enabling or disabling vblank synchronization when running under Linux with NVidia's drivers.

Setting:	Value Type:	Possible Values:	Default Value:	Description:
<system>.enable	boolean	0 1	1	Enable (automatic) usage of this module.

<system>.forcemono cdplay gb gba gg lynx md ngp pce pce_fast pcfx psx sms snes vb wswan	boolean	0 1	0	Force monophonic sound output.

<system>.pixshader	enum	none autoip autoipsharper scale2x sabr ipsharper ipxnoty ipynotx ipxnotysharper ipynotxsharper	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. Note: Mednafen's pixel shaders do not work properly on some AMD graphics cards(there is a diagonal line of distortion) for an unknown reason, possibly a hardware bug. none - None/Disabled autoip - Auto Interpolation Will automatically interpolate on each axis if the corresponding effective scaling factor is not an integer. autoipsharper - Sharper Auto Interpolation Same as "autoip", but when interpolation is done, it is done in a manner that will reduce blurriness if possible. scale2x - Scale2x sabr - SABR v3.0 GPU-intensive. ipsharper - Sharper bilinear interpolation. ipxnoty - Linear interpolation on X axis only. ipynotx - Linear interpolation on Y axis only. ipxnotysharper - Sharper version of "ipxnoty". ipynotxsharper - Sharper version of "ipynotx".

<system>.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.

<system>.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

<system>.stretch	enum	0 full aspect aspect_int aspect_mult2	aspect_mult2	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. aspect_int - Aspect Preserve + Integer Scale Full-screen stretch, same as "aspect" except that the equivalent xscalefs and yscalefs are rounded down to the nearest integer. aspect_mult2 - Aspect Preserve + Integer Multiple-of-2 Scale Full-screen stretch, same as "aspect_int", but rounds down to the nearest multiple of 2.

<system>.tblur	boolean	0 1	0	Enable video temporal blur(50/50 previous/current frame by default).

<system>.tblur.accum	boolean	0 1	0	Accumulate color data rather than discarding it.

<system>.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.

<system>.videoip	enum	0 1 x y	(variable)	Enable (bi)linear interpolation. 0 - Disabled 1 - Bilinear x - Linear (X) Interpolation only on the X axis. y - Linear (Y) Interpolation only on the Y axis.

<system>.xres	integer	0 through 65536	0	Full-screen horizontal resolution. A value of "0" will cause the desktop horizontal resolution to be used.

<system>.xscale	real	0.01 through 256	(variable)	Scaling factor for the X axis in windowed mode.

<system>.xscalefs	real	0.01 through 256	1.000000	Scaling factor for the X axis in fullscreen mode. For this settings to have any effect, the ".stretch" setting must be set to "0".

<system>.yres	integer	0 through 65536	0	Full-screen vertical resolution. A value of "0" will cause the desktop vertical resolution to be used.

<system>.yscale	real	0.01 through 256	(variable)	Scaling factor for the Y axis in windowed mode.

<system>.yscalefs	real	0.01 through 256	1.000000	Scaling factor for the Y axis in fullscreen mode. For this settings to have any effect, the ".stretch" setting must be set to "0".

<system>.debugger.disfontsize md nes pce pcfx psx vb wswan	enum	xsmall small medium large	small	Disassembly font size. Note: Setting the font size to larger than the default may cause text overlap in the debugger. xsmall - 4x5 small - 5x7 medium - 6x13 large - 9x18

<system>.debugger.memcharenc md nes pce pcfx psx vb wswan	string		(variable)	Character encoding for the debugger's memory editor.

Firmware/BIOS

Some emulation modules require firmware/BIOS images to function. If a firmware path is non-absolute(doesn't begin with C:\ or / or similar), Mednafen will try to load the file relative to the "firmware" directory under the Mednafen base directory. If it doesn't find it there, it will be loaded relative to the Mednafen base directory itself. Of course, if the "path_firmware" setting is set to a custom value, the firmware files will be searched relative to that path.

Custom Palettes

Custom palettes for a system should be named .pal, IE "nes.pal", "pce.pal", etc., and placed in the "palettes" directory beneath the Mednafen base directory.

Per-game custom palettes are also supported, and should be named as <FileBase>.pal or <FileBase>.<MD5 Hash>.pal, IE "Mega Man 4.pal" or "Mega Man 4.db45eb9413964295adb8d1da961807cc.pal".

Not all emulated systems support custom palettes. Currently, the following emulation modules support custom palettes:

gb - Note: Use "gbc.pal" instead of "gb.pal" for GameBoy Color games per-system custom palette.
gba
nes
pce
pce_fast
snes

Automatic IPS Patching

Place the IPS file in the same directory as the file to load, and name it <FullFileName>.ips.

        Examples:       Boat.nes - Boat.nes.ips
                        Boat.zip - Boat.zip.ips
                        Boat.nes.gz - Boat.nes.gz.ips
                        Boat     - Boat.ips

Some operating systems and environments will hide file extensions. Keep this in mind if you are having trouble.

Patching is applied in a file format-agnostic way; however, dynamic patching is not done with CD images, nor with firmware.

Advanced Usage

Minimizing video/audio/input Lag

This section is a work-in-progress, tips given may not cover all cases, latency reduction is a black art on modern PCs, etc etc.

Miscellaneous relevant external links:

Hardware Selection

Video Card:
Higher-performing discrete video cards are preferable, but anything with similar or better OpenGL performance to an NVidia GeForce 9500GT should be fine.
Monitor:
Choose a monitor with the lowest input lag(AKA display lag), as well as as a low response time(though response time isn't as an important metric to consider, since it's usually acceptably small on modern end-user PC monitors). Unfortunately, monitor input/display lag is not typically specified by the manufacturer, and it can even vary between different revisions of the same "model".
A monitor capable of 120Hz vertical refresh rate operation, and that also has a low average input lag(<16ms), would be ideal.
Keep in mind that sometimes the "game mode" of a modern monitor(or TV) must be selected in order for minimum monitor input lag.

For the lowest possible video lag, however, obtain and use an old CRT monitor, and set up a video mode with a vertical refresh rate of at least 120Hz.
Sound Card: (To be written)

Settings to Minimize Video Lag

Disabling vsync can also help to reduce keyboard and mouse input lag to a degree, due to the design of common GUI environments and SDL.

Mednafen setting name:	Value for maximum lag reduction:
video.driver	opengl
video.glvsync	0
video.blit_timesync	0

Operating System: Disable vsync and triple-buffering if enabled via your card driver's setting utility or control panel.

Operating System: Set the "max frames to render ahead"(NVidia) or "flip queue size"(AMD/ATI) to "0"(zero) in your video card driver's setting utility or control panel(mostly a Windows-specific tip; TODO: verify that it is relevant for OpenGL).

Operating System: Disable window/desktop compositor("Aero" on Windows Vista and newer).

Mednafen: Choose full-screen resolutions, via the x-resolution and y-resolution settings, that match your monitor's native resolution(assuming it has a native resolution).

Mednafen: Avoid using special video filters and scalers(hq2x, 2xsai, scale2x, temporal blur, etc.) in Mednafen. Mednafen's simple pixel shaders are ok, provided you have a decent video card as specified in the hardware selection section above.

Settings to Minimize Audio Lag

Mednafen: Select a sound driver that is closer to the actual hardware, such as "ALSA" on Linux, and "OSS" on other UN*X platforms. If you choose to use "OSS", heed the advice regarding osscore.conf and max_intrate.

Mednafen: Select a sound device that is closest to the actual hardware; IE "hw:0", "hw:1", "hw:2", etc. on ALSA.
Avoid selecting a higher-level sound device that is routed through a sound server like PulseAudio!

Mednafen: Select a sound buffer size that is as small as possible without causing excessive crackling or speed issues(20ms should be a fairly safe setting with ALSA on a modern multi-core CPU system).

Mednafen: Optionally set the sound period size setting to 500(microseconds).
Note: The system sound card driver may not handle a value this small correctly, and may cause sound card or system malfunctions. Additionally, the system sound card driver may constrain the sound buffer size to an unusably small value.

Mednafen: Set the sound rate setting to your sound card's native playback rate, IE the rate which has the minimum amount of processing done to it before being passed to the DAC or digital output. This tends to be "192000" or "96000" on modern sound cards, "48000" on older(late 1990s, early 2000s), and "44100" on older still(early to mid 1990s). If you don't know, just leave it at the default of "48000".

Operating System: Disable 3D spatialization, equalizer, and other special effects via your sound card driver's setting utility or control panel, if applicable.

Credits

(This section is woefully outdated, being mostly copied from FCE Ultra)

Name:	Contribution(s):
\Firebug\	High-level mapper information.
Bero	Original FCE source code.
Brad Taylor	NES sound information.
Charles MacDonald	PC Engine technical information.
EFX	Testing.
Fredrik Olson	NES four-player adapter information.
goroh	Various documents.
Jeremy Chadwick	General NES information.
kevtris	Low-level NES information and sound information.
Ki	Various technical information.
Mark Knibbs	Various NES information.
Marat Fayzullin	General NES information.
Matthew Conte	Sound information.
nori	FDS sound information.
rahga	Famicom four-player adapter information.
TheRedEye	ROM images, testing.
...and everyone whose name my mind has misplaced.

Licenses, Copyright Notices, and Code Credits

Mednafen makes use of much open-source code from other people, and could not be what it is without their work. Feel free to give them your thanks, but keep in mind most have nothing to do with the Mednafen project, so don't ask them questions regarding Mednafen unless appropriate in context.

In addition to the listing of licenses and copyright notices for code included in Mednafen, the following "non-system" external libraries are linked to:

libmpcdec

  Copyright (c) 2005, The Musepack Development Team
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:

  * Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.

  * Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the following
  disclaimer in the documentation and/or other materials provided
  with the distribution.

  * Neither the name of the The Musepack Development Team nor the
  names of its contributors may be used to endorse or promote
  products derived from this software without specific prior
  written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Tremor

Copyright (c) 2002, Xiph.org Foundation

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION
OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Gb_Snd_Emu

/* Library Copyright (C) 2003-2004 Shay Green. Gb_Snd_Emu is free
software; you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation;
either version 2 of the License, or (at your option) any later version.
Gb_Snd_Emu is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details. You should have received a copy of the GNU General Public
License along with Gb_Snd_Emu; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */

Blip_Buffer

Copyright (C) 2003-2006 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details. You should have received a copy of the GNU Lesser General
Public License along with this module; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sms_Snd_Emu(base for T6W28_Apu NGP code)

Copyright (C) 2003-2006 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details. You should have received a copy of the GNU Lesser General
Public License along with this module; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Handy

Copyright (c) 2004 K. Wilkins

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from
the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software
   in a product, an acknowledgment in the product documentation would be
   appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not
   be misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

PC2e (Used in portions of PC Engine CD emulation)

        Copyright (C) 2004 Ki

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

Scale2x

 * Copyright (C) 2001, 2002, 2003, 2004 Andrea Mazzoleni
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

hq2x, hq3x, hq4x

//Copyright (C) 2003 MaxSt ( maxst@hiend3d.com )

//This program is free software; you can redistribute it and/or
//modify it under the terms of the GNU Lesser General Public
//License as published by the Free Software Foundation; either
//version 2.1 of the License, or (at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
//Lesser General Public License for more details.
//
//You should have received a copy of the GNU Lesser General Public
//License along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

nes_ntsc

/* Copyright (C) 2006 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details. You should have received a copy of the GNU Lesser General
Public License along with this module; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */

2xSaI

/* 2xSaI
 * Copyright (c) Derek Liauw Kie Fa, 1999-2002
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
/* http://lists.fedoraproject.org/pipermail/legal/2009-October/000928.html */

VisualBoyAdvance GameBoy and GBA code

// VisualBoyAdvance - Nintendo Gameboy/GameboyAdvance (TM) emulator.
// Copyright (C) 1999-2003 Forgotten
// Copyright (C) 2004-2006 Forgotten and the VBA development team

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or(at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

trio

 * Copyright (C) 1998, 2009 Bjorn Reese and Daniel Stenberg.
 * Copyright (C) 2001 Bjorn Reese 
 * Copyright (C) 2001 Bjorn Reese and Daniel Stenberg.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE AUTHORS AND
 * CONTRIBUTORS ACCEPT NO RESPONSIBILITY IN ANY CONCEIVABLE MANNER.
 *

ConvertUTF

 * Copyright 2001-2004 Unicode, Inc.
 *
 * Disclaimer
 *
 * This source code is provided as is by Unicode, Inc. No claims are
 * made as to fitness for any particular purpose. No warranties of any
 * kind are expressed or implied. The recipient agrees to determine
 * applicability of information provided. If this file has been
 * purchased on magnetic or optical media from Unicode, Inc., the
 * sole remedy for any claim will be exchange of defective media
 * within 90 days of receipt.
 *
 * Limitations on Rights to Redistribute This Code
 *
 * Unicode, Inc. hereby grants the right to freely use the information
 * supplied in this file in the creation of products supporting the
 * Unicode Standard, and to make copies of this file in any form
 * for internal or external distribution as long as this notice
 * remains attached.

MD5 Hashing

/*
 * RFC 1321 compliant MD5 implementation,
 * by Christophe Devine ;
 * this program is licensed under the GPL.
 */

V810 Emulator

 * Copyright (C) 2006 David Tucker
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Unzipping Code

/* unzip.c -- IO for uncompress .zip files using zlib
   Version 1.01e, February 12th, 2005

   Copyright (C) 1998-2005 Gilles Vollant

   Read unzip.h for more info
*/

/* Decryption code comes from crypt.c by Info-ZIP but has been greatly reduced in terms of
compatibility with older software. The following is from the original crypt.c. Code
woven in by Terry Thorsen 1/2003.
*/
/*
  Copyright (c) 1990-2000 Info-ZIP.  All rights reserved.

  See the accompanying file LICENSE, version 2000-Apr-09 or later
  (the contents of which are also included in zip.h) for terms of use.
  If, for some reason, all these files are missing, the Info-ZIP license
  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
*/

MiniLZO

   Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
   All Rights Reserved.

   The LZO library is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of
   the License, or (at your option) any later version.

   The LZO library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with the LZO library; see the file COPYING.
   If not, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

   Markus F.X.J. Oberhumer
   
   http://www.oberhumer.com/opensource/lzo/

Fuse Z80 emulation code

   Copyright (c) 1999-2005 Philip Kendall, Witold Filipczyk
   Copyright (c) 1999-2011 Philip Kendall

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with this program; if not, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

   Author contact information:

   E-mail: philip-fuse@shadowmagic.org.uk

NeoPop Neo Geo Pocket (Color) Code

//---------------------------------------------------------------------------
// NEOPOP : Emulator as in Dreamland
//
// Copyright (c) 2001-2002 by neopop_uk
//---------------------------------------------------------------------------
//      This program is free software; you can redistribute it and/or modify
//      it under the terms of the GNU General Public License as published by
//      the Free Software Foundation; either version 2 of the License, or
//      (at your option) any later version. See also the license.txt file for
//      additional informations.

SoftFloat (Used in V810 FPU Emulation)

/*============================================================================

This C source file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic
Package, Release 2b.

Written by John R. Hauser.  This work was made possible in part by the
International Computer Science Institute, located at Suite 600, 1947 Center
Street, Berkeley, California 94704.  Funding was partially provided by the
National Science Foundation under grant MIP-9311980.  The original version
of this code was written as part of a project to build a fixed-point vector
processor in collaboration with the University of California at Berkeley,
overseen by Profs. Nelson Morgan and John Wawrzynek.  More information
is available through the Web page `http://www.cs.berkeley.edu/~jhauser/
arithmetic/SoftFloat.html'.

THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort has
been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.

Derivative works are acceptable, even for commercial purposes, so long as
(1) the source code for the derivative work includes prominent notice that
the work is derivative, and (2) the source code includes prominent notice with
these four paragraphs for those parts of this code that are retained.

=============================================================================*/

PC-FX MJPEG Decoding

/*
 * jrevdct.c
 *
 * Copyright (C) 1991, 1992, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 */
(The file is included in the Mednafen source distribution as mednafen/Documentation/README.jpeg4a)

VRC7 Sound Emulation

/*
YM2413 emulator written by Mitsutaka Okazaki 2001

Permission is granted to anyone to use this software for any purpose,
including commercial applications. To alter this software and redistribute it freely,
if the origin of this software is not misrepresented.
*/

NEC V30MZ Emulator

/* This NEC V30MZ emulator may be used for purposes both commercial and noncommercial if you give the author, Bryan McPhail,
   a small credit somewhere(such as in the documentation for an executable package).
*/

NEC V30MZ disassembler(modified BOCHS x86 disassembler)

Caution: Bochs' code is under the LGPL, but it is unclear if "or (at your option) any later version." applies to the x86 disassembler code.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
 
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Cygne

Cygne is distributed under the terms of the GNU GPL Version 2, 1991.
Copyright 2002 Dox, dox@space.pl.

FCE Ultra

/* FCE Ultra - NES/Famicom Emulator
 *
 *  Copyright (C) 1998 BERO
 *  Copyright (C) 2002 Xodnizel
 *  Copyright (C) 2002 Paul Kuliniewicz
 *  Copyright (C) 2003 CaH4e3
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

QuickLZ

// QuickLZ data compression library
// Copyright (C) 2006-2008 Lasse Mikkel Reinhold
// lar@quicklz.com
//
// QuickLZ can be used for free under the GPL-1 or GPL-2 license (where anything 
// released into public must be open source) or under a commercial license if such 
// has been acquired (see http://www.quicklz.com/order.html). The commercial license 
// does not cover derived or ported versions created by third parties under GPL.

Q-Subchannel CRC16 Code

/*  cdrdao - write audio CD-Rs in disc-at-once mode
 *
 *  Copyright (C) 1998  Andreas Mueller 
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

SMS Plus

    Copyright (C) 1998-2004  Charles MacDonald

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Genesis Plus

/*
    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003  Charles Mac Donald

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

Genesis Plus GX

 *
 *  Copyright (C) 2007, 2008, 2009 EkeEke
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

EMU2413(used in SMS emulation)

  Copyright (C) Mitsutaka Okazaki 2004

  This software is provided 'as-is', without any express or implied warranty.
  In no event will the authors be held liable for any damages arising from
  the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not
     be misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

blz

/* Copyright (C) 2007 Shay Green. This module is free software; you can
redistribute it and/or modify it under the terms of the GNU General Public
License, version 2 or later, as published by the Free Software Foundation.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details. You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */

CD-ROM data correction code

/*  dvdisaster: Additional error correction for optical media.
 *  Copyright (C) 2004-2007 Carsten Gnoerlich.
 *  Project home page: http://www.dvdisaster.com
 *  Email: carsten@dvdisaster.com  -or-  cgnoerlich@fsfe.org
 *
 *  The Reed-Solomon error correction draws a lot of inspiration - and even code -
 *  from Phil Karn's excellent Reed-Solomon library: http://www.ka9q.net/code/fec/
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA,
 *  or direct your browser at http://www.gnu.org.
 */

C68K

/*  Copyright 2003-2004 Stephane Dallongeville

    This file is part of Yabause.

    Yabause is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    Yabause is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Yabause; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

YM2612 Emulator

/* Copyright (C) 2002 St�phane Dallongeville (gens AT consolemul.com) */
/* Copyright (C) 2004-2006 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */

Sega Genesis SVP/SSP16 Emulator

/*
 * basic, incomplete SSP160x (SSP1601?) interpreter
 * with SVP memory controller emu
 *
 * Copyright (c) Gražvydas "notaz" Ignotas, 2008
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the organization nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

Speex Resampler

/* Copyright (C) 2007-2008 Jean-Marc Valin
   Copyright (C) 2008      Thorvald Natvig

   File: resample.c
   Arbitrary resampling code

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are
   met:

   1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

   2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   3. The name of the author may not be used to endorse or promote products
   derived from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE.
*/

SABR v3.0 Shader

        SABR v3.0 Shader
        Joshua Street

        Portions of this algorithm were taken from Hyllian's 5xBR v3.7c
        shader.

        This program is free software; you can redistribute it and/or
        modify it under the terms of the GNU General Public License
        as published by the Free Software Foundation; either version 2
        of the License, or (at your option) any later version.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with this program; if not, write to the Free Software
        Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.