What firmware are you on? And yes, you get the eboot of the ps1 game, place it inside a folder by the name of said game, which is then in turn placed inside your GAME folder, so the directory would look as follows (i'm using resi as an example): ms0:/PSP/GAME/ResidentEvil/EBOOT.PBP
PSP, all the way from 1.00 to 5.50 GEN D2 - DS Lite w/ M3DS Real (M3 Sakura v1.34)
PS3 3.01 - iPod Touch 2G 16GB Jailbroken - Xbox 360 60GB - PC, Q6600, 3GB DDR2, GTX260 (216) 896MB
PSP, all the way from 1.00 to 5.50 GEN D2 - DS Lite w/ M3DS Real (M3 Sakura v1.34)
PS3 3.01 - iPod Touch 2G 16GB Jailbroken - Xbox 360 60GB - PC, Q6600, 3GB DDR2, GTX260 (216) 896MB
1,2, and 3 is was on the ps1 i should know because i have them all but the thing about re2 is that to play the full game you need a certain game save id for it because if you just put in a random 1 it would freeze at the part when you enter the police station
