> Tekken 1-3 ran on psx based hardware in the arcade (System 11/12). That allowed
> for arcade perfect ports of T1 and T2 to the psx and a scaled down version of T3
> (I think the psx lacked enough vram and was slightly slower than the system 12
> hardware). However, since the ps2 has the ps1 cpu for backwards compatibility
> (and doesn't it also handle i/o?), is it really emulated or just running from
> the ps1 cpu?

I think that it uses the ps1's cpu because somes guys with old modchips got a "insert disc error" when they tried to play T123 (early versions of modchips didn't allow to boot ps1 backups)