is there any way to play a PSX ISO in a PSX or PS2?

just curious because we have the flash cart for the nds's i was wondering if there was a way to do the same with PSx's.

Yes, they are done through Mod chips (chips that you physically put inside the PSX or PS2) or through the use of Swap Discs. Discs that you put into the PSX or PS2, then change out to a burned copy of the game.

thx i'll look into it