Right now, it is not a lot because it is ancient and no one cares for it anymore. Unless you can find a addictive person that loves PS1's, but i will sell you my one for £20 for some games and the console!
Ps1 is playstation 1 the very first playstation system
No, a ps1 can only play ps1 games and CD's.
you need a ps1 memory card
Nothing they do not buy PlayStation 1 or sell them
no you can not play a PS2 game in a PS1 console
No. You can play Legitimate PS1 games on a chipped PS2, but you cannot play PlayStation 2 Games on a PlayStation 1.
Yes, every PS3 can play PS1 games.
Yes they are. PS2 are "backwards" compatible with PS1 games
Yes you can. PS2 is compatible with PS1 games
Yes, you can run Playstation 1 games on a Playstation 3 (PS3), a PS2, and a PS1. You can play them on all the Playstation game systems available, some just work better than others.
yes but only to play a ps1 game
All PlayStation 1 games should be able to play on PlayStation 2.