Well I won't engage you in an argument about the definition of a computer, but there is a linux kit with OS, keyboard, mouse, hard drive and network adapter available for the PS2 at:
http://www.us.playstation.com/purchase.aspx?id=hardware
The PS2 hard drive has it's own file system, but it is possible to put the filesystem on any standard hard drive. Newer versions of the PS2 include a network adapter so it can now be connected through your network.
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