QUOTE (LocalH @ Mar 23 2011, 06:16 AM)

QUOTE (Uberham @ Mar 22 2011, 02:40 PM)

Chip your PS1, get a swapmagic disk for your ps2 slim.
Swap Magic doesn't allow booting of PSX backups on a PS2 (not sure about original imports, however). AFAIK, on the PS2 you're limited to either a modchip or the swap method (blocking the sensors in the slim, allowing the drive to be opened without the console knowing). Swap method might work with something like the aforementioned X-Change 2 disc, but never tested it.
There are ways.
Using an action replay/exploder disk, boot to the code screen, start without selecting any codes, you'll be asked to insert your game, unstick the only visible switch (the metal one on the inside of the lid) and insert a legit PS1 game, stick the switch back down.
the game will read, spin up, then either stop, or spin at a constant rate, swap for your backup.
hit play, and it'll load like any other game, easy.
Besides, why would he want to play his PS1 backups on his PS2? he's got a chipped PS1 for that!