Now that you have ePSXe setup and ready to run it is time to give your games one further enhancement... PEC
As you can see from the picture it's a plugin. That means you will get good results from using this program. Basically it is a cartridge that can use just about any type of code that there is! Click on the image to dowload it :: 819kb

Now that you have it, you should unzip it to the ePSXe folder, and move the GPUPEC.DLL to the plugins folder. Once that's done open up ePSXe and goto the graphics plugins setup. From the list selet PEC, and the config. From that list select the plugin you were using previously and heck the settings are the same (they should be) once thats done put the refresh rate to it's max.

To use PEC, simply run your game as normal, just when you feel the need to cheat press [escape] to return to the main ePSXe screen and then run PEC from the folder. Now you just select the cheats that you want and click [send to plugin] to get it running. Thus you are done so now simply return to the game where the cheats will take effect!

On a side note, you may need to select [options] >> [interface] >> [plugin] from the PEC program, you should only need to do this once, or it may be already selected, it's best to check though!

ADDING CODES TO PEC

To add a code, you need to open up the file named [codelist.inf] and move to the place where you want your code to go. For instance, you might want to add a code to 'Luck Luke' for infinite energy.

#Lucky Luke#SLES-00943
"Infinite Lives
8009FE70 00FF
"Infinite B's
8009FE78 00FF
"Infinite Dynamite
8009FE76 00FF
"Infinite Money
8009FE74 00FF

#Lucky Luke#SLES-00943
"Infinite Lives
8009FE70 00FF
"Infinite B's
8009FE78 00FF
"Infinite Dynamite
8009FE76 00FF
[make some space for the code]
"Infinite Money
8009FE74 00FF

#Lucky Luke#SLES-00943
"Infinite Lives
8009FE70 00FF
"Infinite B's
8009FE78 00FF
"Infinite Dynamite
8009FE76 00FF
"Infinite Energy
8009FE72 0003
"Infinite Money
8009FE74 00FF

Just ensure that you put a ["] at the begining of the code's name, and make sure you don't leave gaps!
But what if your game isn't there? The answer is simple...

#GAME1#SLES-00943
"Some Code Name
8009FE70 00FF
#GAME2#SLES-00943
"Another Code Name
8009FE70 00FF

#GAME1#SLES-00943
"Some Code Name
8009FE70 00FF
[Make some space as normal]
#GAME2#SLES-00943
"Another Code Name
8009FE70 00FF

#GAME1#SLES-00943
"Some Code Name
8009FE70 00FF
[#GAME NAME#CODE ON THE BOX -ie SLES-00627-]
#GAME2#SLES-00943
"Another Code Name
8009FE70 00FF

Another tip is if you have many codes for a game that are related, such as for player one, then two...etc, you can group them by using a \slash. EG:
"PLAYER ONE\Inf.Health
29bec0a3 0661
"PLAYER ONE\Inf.Magic
29ef20d3 0281
This means that inside PEC each part in that group will come under it's own sublist on that game. Handy, no?