ProSystem

Atari 7800 ProSystem emulator (libretro). Good compatibility with the 7800 library, with BIOS and paddle controller support.

1. Installation

1. In RetroArch: Load Core → Download a Core.
2. Search for ProSystem in the list and install it.
3. Return to the main menu, then Load Content to open your game.

2. System files

This emulator relies on files taken from the original hardware. Extract them from hardware you own.

Files expected according to our listing:

• 7800 BIOS (U).rom

Indicated location: bios/

7800 BIOS required

3. Supported formats

.a78

4. Good to know

• Settings are found under Quick Menu → Options once the game is loaded.
• Remember to Save Core Overrides to keep them from one session to the next.
• Controllers are configured once in Settings → Input, for all cores.

5. Not working?

• Refuses to start or black screen → a system file is missing, misnamed, or not in the expected location.
• File rejected → its checksum doesn't match the expected one; the dump is probably incomplete or from a different model.
• Game doesn't show up → check that its extension is among the formats listed above.
• The core won't load → update RetroArch, then reinstall it.