[jonix]

Yes the PS2 can take 98% of PS1 games. Sony have confirmed a list of PS1 games that are not compatible for PS2 use. They are:
* Arcade Party Pak,
* Atari Arcade Greatest Hits,
* Fighter Maker,
* Final Fantasy Anthology,
* International Track and Field,
* Judge Dredd,
* Monkey Hero,
* Mortal Kombat Trilogy,
* Tomba

quelle: http://www.ps2home.co.uk/ps1_games_on_ps2.htm