oi.
http://www.pspbrew.com/forum/viewtopic.php?t=7949
I posted for help there, but was able to find the info after a few days. Now the above was for GBC. But im gunna go ahead and guess its 'prolly done the same way. I'm not at home w/ my PSP or laptop to check.
But you could.. hook your psp to comp..acess the Cheat File that most Emu already have. See what the file is saved in. If .tch format, the what i reposted should work.
If in another format, try it still.
If you can't turn the codes ON/OFF, then it didn't work T.T