Cheat DISC's (that work in pSX v1.13)

I recommend you try out the excellent RAM hacking tool called CheatEngine.
You can find codes quickly with any emulator...

Using the emulator pSX, you can use GameShark codes if you:

A. Boot a GameShark v5.0 disc, then the game

or

B. Boot a CodeBreaker disc, then the game

NTSC Disc that runs NTSC and PAL GameShark Codes
http://www.megaupload.com/?d=KVR8ZC7C

PAL Disc that runs NTSC and PAL GameShark Codes
http://www.megaupload.com/?d=V4SGZ84I

Sites that have GameShark/Xploder/CodeBreaker codes for PlayStation 1:
http://cheats.codetwink.com/psx/
http://bsfree.org/index.php?s=1&d=8
http://gshi.org/?s=v2&sys=1

And for Guides and Saves:
http://www.gamefaqs.com/ps