Let me see - over the years I've had (and all still working I add

)
Commodore VC 20
Commodore 64
Ohio Superboard (With m$ basic on rom)
Acorn Electron
BBC 'A'
BBC 'B'
BBC Master 128
Amiga 500,600,1200 (with blizzard accelerator and hdd)
486dx100
AMD K6 III - 400mhz
Athlon 1ghz
Duron 1.8ghz
Athlon XP 2.6
P4 2.66ghz
P.4 3.02ghz
NES
Master system
Megadrive
Mega CD
Amiga CD32 (Well someone had to)
PS1
PS2 (Old style 1st gen)
PS2 (New slim one)
Game boy
Game boy color
Game boy Advance
Game boy Advance SP
These are the one I've used. I've been given some spectrums and an amstrad cpc6128.... But they just get left in the loft.
My newest addition will no doubt be either a nintendo DS or a psp. But that's a discussion for another thread