if u try to play your original game and a black screen comes up with a red circle and a line through it sayin that your system may be modified then u will know that, that game is mod chip protected. this is when the patching comes into play. Here u will find out more info about patches and patching
####://www.megagames.com/psx/psx_patches.htm

and here u'll find good tutorials
####://www.psxcopyworld.co.uk/