This guide details how to play Sega CD games on your Steam Deck using EmuDeck. We'll cover setup, ROM transfer, and optimization for optimal performance.
Pre-Installation Steps:
Enable Developer Mode and CEF Remote Debugging on your Steam Deck to ensure compatibility with EmuDeck updates. Instructions:
- Access Steam Menu (Steam button).
- Go to System > Developer Mode and enable it.
- In the Developer menu, enable CEF Remote Debugging.
- Power menu > Desktop Mode.
Essential Items:
- High-speed A2 microSD card.
- Legally obtained Sega CD ROMs and BIOS files.
- (Optional but recommended) Keyboard and mouse for easier navigation.
SD Card Formatting:
- Insert microSD card.
- Steam Menu > Storage > Format SD Card.
EmuDeck Installation:

- Switch to Desktop Mode.
- Download a browser (from the Discovery Store).
- Download EmuDeck, selecting the Steam OS version.
- Run the installer, choose Custom installation.
- Select your SD card as the installation location.
- Choose RetroArch, MelonDS, Steam ROM Manager, and Emulation Station (or select all emulators).
- Complete the installation.
Transferring Sega CD Files:

- Open Dolphin File Browser (Desktop Mode).
- Navigate to your SD card (Primary).
- Go to
Emulation > BIOS and transfer your BIOS files.
- Go to
Emulation > ROMS > segaCD (or megaCD) and transfer your ROMs.
Adding ROMs with Steam ROM Manager:

- Open EmuDeck, then Steam ROM Manager.
- Click Next, then skip the Nintendo DS steps.
- Click "Add Games," then "Parse." SRM will organize your games and covers.
Handling Missing Covers:

If covers are missing:
- Click "Fix."
- Search for the game title.
- Select a cover and click "Save and Close."
Manually add covers using "Upload" if SRM cannot find them.
Playing Sega CD Games:

- Steam Menu > Library > Collections > Sega CD.
- Select and play your games.
Using Emulation Station:
Emulation Station (if installed) provides a more organized library. Access it via Steam Menu > Library > Non-Steam. Use the Scraper function for metadata and cover art.
Installing Decky Loader:

- Switch to Desktop Mode.
- Download Decky Loader from its GitHub page.
- Run the installer and select "Recommended Install."
- Restart your Steam Deck in Gaming Mode.
Installing and Configuring Power Tools:

- Open Decky Loader (QAM button).
- Install Power Tools from the Decky Store.
- Launch a Sega CD game.
- Open Power Tools (via Decky Loader).
- Disable SMTs, set Threads to 4.
- Open the Performance menu (battery icon), enable Advanced View.
- Turn on Manual GPU Clock Control, set GPU Clock Frequency to 1200.
- Use Per Game Profile to save settings.
Restoring Decky Loader After a Steam Deck Update:

If Decky Loader is removed after an update:
- Switch to Desktop Mode.
- Re-download Decky Loader from GitHub.
- Run the installer (select "Execute").
- Enter your sudo password (or create one).
- Restart your Steam Deck.
Enjoy playing your Sega CD games on your Steam Deck!