ps1 ntsc us & jap on ps2 chipped?

[craigy]

hello out there can anyone help i have a uk ps2 3000 series with p at end of serial code and has been chipped to play backups but will only play pal games have tried to load ntsc us and jap but just keep getting a black screen and nothing happens i have heard about ar2 to boot up but dont know what chip has been put in any help would be appreciated thanks craig