for action replay you need the codelist.bin.
you can get it
here.
you have replace the old codelist on your cd with the new codelist.
use
PS2 Savebuilder to unpack the codelist from the .max archive
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My System: C2D E6700 @3.4ghz | Asus P5W DH Deluxe | 4GB DDR2 800 | eVGA Geforce GTX 260 55nm SC-Edition
Tutorial: Hardware Antialiasing in PCSX2 (DX9 only)