hmmmmmmmmmm i would ADVISE yes get a mod chip as the KNIFE methods usually end up BREAKING your systems
as for connection to a computer you do not do that with a PS2 its only the X-BOX but this is for making backups of your games using the ethernet/broadband connector
i would recommend asking about for a reliable person to do the modding if you are not confident to do this yourself
ITS THE ONLY guranteed way of gettin backups to load without damaging your systems and no doubt
LESS Hassle in the long run