If you got cuffs like this then cuff me up and throw away the key we’ll be friends forever.
Okay, Here’s step by step setup.
Go to duckstations github page and grab the latest DuckStation-x64.AppImage github.com/stenzek/duckstation/releases/…/latest
Get the ps1 bios files, They can be found here psbios.gitlab.io/bios/ps1-bios/ It will be in a .zip you will need to extract it afterwards you will have a lot of .bin files.
Get your tekken 3 ROM file, It will usually be in a .rar or .7z so you will need to extract the ISO.
Next you will need to launch duckstation, I’m not sure if your DE will prompt you to mark the appimage executable but if not open a terminal and run " cd Downloads ; chmod +x DuckStation-x64.AppImage " then it should open the installer when you double click it.
During installation you will be asked for a BIOS directory, Click on the PSX folder containing all those .bin files. After that it will ask for game directory, Choose the folder where you placed the .iso for tekken 3.
Beyond that you will need to setup your controller, Any USB controller should work. Graphics settings should be okay at the defaults. That should be the full setup process, Let me know if you got any questions or need more explanation.