Thanks for the answer. I have been trying out Soukuygurentai and Toaplan shooting battle. However, I don’t have any further reference which resolution these games run in original psx. I will try tonight with other psx games to see if any of them show other than 480i.
Wrt. the component cable, cable is high quality component cable made by Sony so it should be compatible, I guess. The thing is, I own several consoles by sony so I cannot 100% remember to which devide I bought this cable, I think it was for ps3 and it looks like it should fit ps2 too. But since neither tv nor OSSC show a signal, I guess cable is not compatible.