A potentially hard question, one to which many may not know the answer.
Sony has recently addressed many problems the PS3 was facing. According to this article, the issue regarding PS1 and PS2 games looking gow-aweful when played on PS3 has been corrected via a downloadable update. This is great news for me personally, as I originally intended to buy a PS3 but keep my PS2 around for this reason. However, now it seems that I'll be able to trade in my PS2 towards the purchase of a PS3 and save some money.
Now here's my question: when I started playing my PS1 games on PS2, Gameshark had a few issues, the most prominent being that PS1 Gameshark codes that started with the number 5 didn't work on PS2. (Fortunately, there was a website at the time where you could enter a "5" code, and it "splits" it into a few hundred lines of "8" codes that would achieve the same effect as the original "5" code. An example of this would be FF8's All Item code, which, as a "5" code, doesn't work on PS2. I obtained this long-assed "8" code--which had to be entered into four parts on my Gameshark--which achieved the same effect. Unfortunately, I no longer have that URL.:() So does anyone know if Gamesharks from previous generations have any problems working on the PS3?