How to run PS1 games?

How do you play PS1 games in 3.90 M33-2 firmware phat PSP? I have a PS1 iso.

Now where do I put it to play it on my PSP?

You might find this tutorial useful: http://www.psp-hacks.com/forums/viewtopic.php?id=119276

Try this tutorial, you need to convert the ISO into an executable EBOOT file.

Just curious. What is the average size of a PS1 game (ISO or CSO)?

[DarkPacMan77]

Average? Maybe a couple hundred megabytes. Many downloaded ps1 games will already have content ripped though, so it's hard to pinpoint an "average".

-DarkPacMan77-