This guide details how to install and configure emulators for Sega Master System games on the Steam Deck using EmuDeck, Decky Loader, and Power Tools. It's been updated to reflect best practices for optimal performance and post-update restoration.
Quick Links
The Sega Master System, a classic 8-bit console, boasts a library of fantastic games. The Steam Deck, combined with EmuDeck, provides a powerful platform for enjoying these titles.
Updated January 15, 2024, to include Decky Loader and Power Tools for enhanced performance and post-update troubleshooting.
Before You Begin
Prior to installation:
- Ensure your Steam Deck is charged or plugged in.
- A high-speed microSD card (or external HDD, sacrificing portability) is required, formatted within the Steam Deck.
- A keyboard and mouse are recommended for easier navigation. Alternatively, use the on-screen keyboard (Steam + X) and trackpads.
Enable Developer Mode
Essential for smooth emulator operation:
- Access the Steam menu, then System > System Settings.
- Enable Developer Mode.
- Access the Developer menu (bottom of the access panel).
- Enable CEF Remote Debugging under Miscellaneous.
- Restart your Steam Deck. (Note: CEF Remote Debugging may require re-enabling after updates.)
EmuDeck Installation
- Enter Desktop Mode (Steam button > Power > Desktop Mode).
- Download EmuDeck via a browser (Chrome, Firefox, etc.).
- Choose the correct SteamOS version.
- During installation, select Custom Install.
- Select your SD card (it will be renamed "Primary" for easier identification).
- Choose RetroArch (and Steam ROM Manager) for Sega Master System emulation.
- Enable "Configure CRT Shader for Classic 3D Games" (optional).
Transferring Master System ROMs
- Open Dolphin File Manager.
- Navigate to Removable Devices > Primary > Emulation > ROMS > mastersystem.
- Copy your Sega Master System ROMs (
.smsfiles) into this folder.
Adding Master System Games to Steam
- Open EmuDeck in Desktop Mode.
- Launch Steam ROM Manager.
- Disable Parsers, then select Sega Master System.
- Choose Add Games > Parse.
- Verify game and artwork display, then Save to Steam.
Addressing Missing Artwork
Missing or incorrect artwork can be fixed:
- Click "Fix" on the cover frame. Steam ROM Manager will attempt automatic retrieval.
- If needed, manually search for and select the correct artwork, then save.
Uploading Artwork
For artwork not found automatically:
- Save the artwork to the Steam Deck's Pictures folder.
- Click "Upload" on the cover frame.
- Select the artwork, save, and verify its display.
- Click "Save to Steam."
Playing Master System Games
- In Gaming Mode, access your Steam Library.
- Select the "Collections" tab (R1 button).
- Choose your Sega Master System collection and launch a game.
Performance Optimization
For smoother gameplay:
- In-game, access the Quick Access Menu (QAM).
- Open the Performance menu.
- Enable "Use game profile."
- Set Frame Limit to 60 FPS.
- Enable Half Rate Shading.
Decky Loader Installation
- Switch to Desktop Mode.
- Download Decky Loader from its GitHub page.
- Choose Recommended Install.
- Restart in Gaming Mode.
Power Tools
- Access Decky Loader via the QAM.
- Install Power Tools from the Decky Store.
- Configure Power Tools (disable SMTs, set Threads to 4, adjust GPU clock, etc.) Save per-game profiles.
Restoring Decky Loader After Updates
After Steam Deck updates:
- Switch to Desktop Mode.
- Re-download and run the Decky Loader installer (select "Execute").
- Enter your pseudo password (create one if necessary).
- Restart in Gaming Mode.
