Acorn Electron - Blew Up when turned on with the joystick expasion card incorrectly attached!
Commodore 64 - Dizzy Games were awesome!
Commodare Amiga 600 - Upgraded with extra RAM and a whole 20mb of hard drive space! Wings running from the hd was awesome, monkey island 2 was a lot more fun without the disk swapping too!
486 DX4 100 - 8mb ram, cant remeber the other specs, running win95
AMD K6-2 500 - Bought some random leftover parts from a mate at uni to upgrade.
AMD Athlon XP 1900 - First major self built system, had 512mb Ram and a GF3 Ti500
AMD Athlon 64 3500 - Current system, Gigabyte 3d1 setup with their odd 2 6600 GT's chips on one card