The emulators are useless now. Because you are just play the ps1 game like a psp game.
But the part i dont understand is, why are the ps1 games in isos. Mine are in eboots.
You are just supposed to download the bin file or img file and then convert it to an eboot with popstation GUI.
Here is an easier way.
Forget everything that you did and i will teach you how to put a ps1 game on your psp.
1.Download this : http://dl.qj.net/Simple-Popstation-GUI-v2.21-Beta-PSP-Tools-Utilities-(on-PC)/pg/12/fid/12220/catid/192
2.Download an iso, img, cue, bin, or pbp file of the ps1 game you want.
3.Put the file in the program you downloaded in step 1.
4.Press "GO"
5.After the file converts, it should be in a folder.
6.Drag the whole folder in your PSP
THATS ALL!!!