A very stuffty Windows 98, it is.
Playstation 3 is also basically a PC, I'm using it with mouse and keyboard (Take that, 360!) and you can even install another operating system on it (Settings menu - System - Install Other OS - [Put Windows/Linux/Mac install disc in, install, and bam]). Except PS3 only has 512 MB of RAM built-in, the Graphics card has 3GB dedicated to it, apparently.