1. Savestate

Save the state to the slot selected.

2. Loadstate

Load the state of the slot selected.

3. Changedisc

Some games could require to changedisc on gameplay. Use this option to change the previous/next disc.

4. Toggleframelimit

You can enable/disable the framelimit, so you can pass some part of the game faster.

5. Cheatcodes

In this option, you can enable/disable cheat codes for the game which you are playing. If you don't have cheat codes for this game, you will see a download button to get cheatcodes file from our server. ePSXe supports GameShark cheat codes. You can download the cheat codes from our server with the Download button on cheatcode option during gameplay or create your own file.
In the second case, you can load cheat codes in the emulator creating a file called 'sdcard/epsxe/cheats/SXXX_XXX.XX.txt (where SXXXX_XXX.XX is the PS-EXE name of the game, which you can see in exit option, or in the cheat code option during gameplay) in your sdcard. For example in Final Fantay 8 US-NTSC the file name is:
'epsxe/cheats/SLUS_008.92.txt'.
ePSXe supports 256 codes per file. The file format is:
#description of cheat code 1
XXXXXXXX YYYY
ZZZZZZZZ AAAA
#descripion of cheat code 2
NNNNNNNN MMMM
For example for Final Fantasy 8 US-NTSC, it could be:
#Zell level 20
800778a4 4a38
Currently, only 80XXXXXX, 30XXXXXX, 50XXXXXX, 1F800XXX, D0XXXXXX, D1XXXXXX, D2XXXXXX, D3XXXXXX, E0XXXXXX, E1XXXXXX, E2XXXXXX, E3XXXXXX gameshark codes are supported, the rest will be ignored. You can find GameShark codes in a lot of webpages in internet, like:
http://psxdatacenter.com
http://www.gamegenie.com/cheats/gameshark/ps1/index.html
After that, re-load your game, and you will be able to enable/disable the gameshark codes from the menu 'cheat codes' on gameplay (disabled by default).

Well, I will assume you have the emulator installed and configured. Otherwise, you can download ePSXe from the Official Website.

Now, open the emulator, click on Run, then on the option Enable Logs and restart the program. It will show you another window, now run the game and copy somewhere the information that will be shown at the highlighted area, see the picture below:

In this case, the code is SCUS-941.63, which is for the game Final Fantasy VII (US version).

Now navigate to the main directory of the emulator and open the cheat folder, right click on it and create a text document with the same name of the game region code we saw above. For example, in this case the text file will be called SCUS_941.63, like the picture below:

NOTE: Be careful, you have to change the hyphen ( – ) to an underline ( _ ).

Now open this file and let’s put the codes. You can find many on the Internet. Now that you have them, write the codes in the format below:

NOTE: There’s a space between the 8th and 4th digit. It should be like the picture below:

Ok, almost done. Now, open the emulator, run the game. Then, press ESC to return to ePSXe menu, click on Option and choose Cheat Codes. Here you should see the codes descriptions that were put in step 2. If not, go to the step 2 and try again. Now select the codes you want to enable (left side) and click on the Enable-> button, or you can just click on Enable All. It’s the same if you want to Disable, just select the code (right side) and click on <-Disable, or just hit Disable All. Check the picture:

In this example, only the Max HP code is enabled. After that, just hit OK, then click on Run, and Continue to return to the game. Now you know how to enter gameshark code in ePSXe! Have fun!

WARNING! Try to enable a few codes at once, since GameShark codes can break your save game.