PS One mod chips work with all PS One models. PS2 mod chips work with all PS 2 models. Here is some information about Mod Chips and why they are needed. Backups CDs are fragile. If you've had a CD for any period of time, you know how easily they scratch and warp.
Most game manufacturers provide no scratched and damaged CD replacement policy.
On the other hand, you can backup your data on CD-R media. Unfortunately, backup CD-R's can not be read by your PlayStation. Until now . A ModChip will reprogram your PlayStation so it can read your CD-R backup, saving you money on expensive CD replacements. No constant, annoying swapping of CDs to play your games.