Play backup games with no chip?

[Gurm]

Ok, first of all A03 is screwing with you. Shame, shame A03!

Secondly, CrazH is recommending an excellent solution - if you like the idea of physically damaging your PS2 every time you want to play a game. Every trick that involves a "tool" or "slide card" or "knife" or whatever involves JAMMING a SHARP OBJECT into your PS2 WHILE THE DISC IS SPINNING and PRYING the door open. It's just not a good idea.

Get a MOD chip.