PS1:Unirom

Unirom is a custom firmware for parallel port cheat cartridges — such as an Action Replay, GameShark, or Xplorer — on a PS1 created by JonathanDotCel. The firmware installer is loaded from a burned CD and modifies the cartridge without modifying the PS1 itself. Unirom can alternatively be installed to a memory card via FreePSXBoot. Support can be found at the PSX.dev Discord

Features

Features of Unirom include:

• Ability to boot burned backups of games.
• Ability to boot import (other region) games without color issues.
• Ability to boot homebrew.
• Memory card manager.
• File browser.
• ROM backup to/from memory card.
• Launch homebrew from memory card.
• Dualboot with Caetla.
• Serial upload/download tools.
• Kernel-resident SIO (debug games).
• Exception handler, Hex editor, Card Editor, and other debug tools.
• XFlash compatibility.

Installation and Usage

Official installation instructions can be found on this GitHub page.

Official usage instructions can be found on this GitHub page.

Troubleshooting

• Unirom not booting.
  • Likely, your parallel port, cartridge, or memory card is dirty. See [[Cleaning Cartridges|this page] for instructions to clean it.
• Game not booting
  • Check your source file. If it ends in .ecm, you will need to use the tool unecm to convert the file to a .bin and burn the new file.
  • Try booting with the opposite method.
  • Check that the disc is clean.
  • Try burning using a different burner, speed, or disc brand.