What does a PS2 modchip do ?
A Playstation 2 modchip provides the boot sector information needed to start backup copied games and also imported games so they can be played. The neo 2, 2.2, 2.5, neo key and STAR chips also require you to use a boot CD. More recent chip releases including the messiah and neo 4 do not require you to use a boot CD and may also include other features such as disabling macrovision protection.