Videomaster VisionScore Home T.V. Game (1977) - in other words PONG (still got in box!)
Amstrad CPC-464
Atari ST FM
Sega Master System
Sega Game Gear (still got!)
Sega Megadrive (still got!)
Sega Mega CD (still got!)
Atari Lynx (still got!)
Super Nintendo
486 DX2-50
P2 233
P3 500
P4 2.6GHz
PS1
Xbox
Xbox 360
Nintendo Wii

I think thats it though could have had some more, so many its hard to remember them all ;D