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Mednaffe guide

❗ Follow the Getting Started section of README.md first.

This section of the guide explains how to setup Mednaffe, a front-end for Mednafen, a multi-system emulator.

A screenshot of Mednaffe running Ginga Fukei Densetsu Sapphire

Installing Mednaffe

Open Discover, SteamOS' app store, then search for Mednaffe, then click on it.

Discover

In the top right, select Sources, then Flatpak, then press Install.

Alternatively, open up a terminal and run

flatpak install --user -y com.github.AmatCoder.mednaffe

Configuring Mednaffe

Issues with sound

Open up the emulator, then navigate to Global Settings > Sound. Make sure Enable sound output is ticked, and that Driver is set to sdl, otherwise you won't get any sound.

Input mapping

Switch to the Systems tab. For each system, you can map various controllers under the Input sub-tab. In Desktop mode, you'll need to launch Steam before mapping Steam Deck inputs properly, otherwise it won't be recognized as a controller.

(Input device refers to the emulated system's controller, not the real one you're using)

Graphics (optional)

From the same Systems tab, you can access a Graphics sub-tab for each system, in which I'd recommend making the following changes:

  • In Fullscreen, set Stretch to fill screen to aspect, otherwise by default the output will be integer-scaled (to the nearest multiple of 2), so it won't fill your Steam Deck's screen.

  • This one is quite personal, but making changes to either the Scaler/Filter or Shader tabs might suit you, if you're looking for a specific feel. My recommended setting would be autoipsharper for OpenGL shader in Shader, but you might want to tweak and read Mednafen's documentation.

CD BIOS (optional)

You will need to get syscard3.pce (BIOS) for PC Engine CD / TurboGrafx-CD emulation and set the correct path in the Systems > Emulation tab (CD BIOS).

Steam ROM Manager

Open Steam ROM Manager, press Parsers, then enter the following settings:

  • Select NEC PC Engine/TurboGrafx 16 - Retroarch - Beetle PCE under Community Presets.

    • Steam ROM Manager doesn't have a preset for non-RetroArch PCE (Mednafen), so we're going to modify the RetroArch one.

  • You can add additional categories to Steam category using the format ${category name}, this is case-sensitive.

  • Change configuration title to NEC PC Engine/TurboGrafx 16 - Mednafen to make it less confusing.

  • Tick Show advanced options and untick Append arguments to executable.

  • Set executable to /usr/bin/flatpak.

  • Set command line arguments to run --branch=stable --arch=x86_64 --command=mednafen com.github.AmatCoder.mednaffe "${filepath}".

    • NB: --command=mednafen is important here, as we're effectively launching the Mednafen CLI from within the Mednaffe flatpak.

  • Set ROMs directory to wherever your PC Engine/TurboGrafx-16 ROMs are - if you're using the recommended path, this should be ~/roms/pce.

    • If you have .pce ROMs, you will need to change User's glob to take those into account, eg. ${title}@(.7z|.7Z|.ccd|.CCD|.chd|.CHD|.cue|.CUE|.iso|.ISO|.pce|.PCE|.zip|.ZIP).
    • If you have sub-directories for your ROMs (eg: PC Engine CD ROMs in the .cue/bin format), then an appropriate User's glob would be: ${title}/*.@(cue|CUE).

  • Press save.

Mednafen parser example

Go to the Preview tab, then press Generate App List. You should see your games populated. You can change the cover art used by hovering over the game and pressing the arrows.

If it looks fine, press Save app list. Load up Steam or switch out of desktop mode, then check your library - you should see your PC Engine/TurboGrafx-16 games!

If you have separate ROMs directories for PC Engine CD/TurboGrafx-CD/SuperGrafx games, then repeat the same process with a different parser.