PS2 backwards Compatability, Technical Explanation Required

**PrincessH** · 08-03-2005,09:14 PM

Hi,

For the purposes of sheer curiosity, and for proving a point in a debate, could someone who's pretty familiar with the PS2 Hardware list a rundown of exactly what happens when a PS1 game is inserted and the PS2 is powered on?
I'm of the beleif that the IOP chip handles the playback of said title, but I've got a comrade who INSISTS it's all software emulation.

If someone could shed a little light on this matter, I'd be greatly appreciative.
Thanks!

**Dark_Killer** · 08-03-2005,09:42 PM

The hardware is so similar between the psx and the ps2 that software emulation is not necessary. "Emulation" is accomplished 100% through the use of a driver known as PS1DRV.

**zabolyx** · 08-03-2005,11:36 PM

As to my knowledge....

The IOP is the same chip as what was in the PS1... with a few extras for the PS2 to use... it interfaces with the HDD, USB, and NA for the PS2 and runs the PS1 games... that is why the PS2 can not play PS1 games from the HDD because the chip can't be used by both systems at once

and he's right about the PS1DRV code in the PS2's ROM.... it allows for the system to use the IOP in PS1 mode... and also allows for the Independence Exploit to boot from a PS1 game.

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