Hmm, thinking about it, I have:

ZX81 (with a 16K RAM Pack)
Acorn electron (with Plus 1 and Plus 3 expansion modules)
BBC Micro, with various add ons such as mouse, Music 500
PSION Organiser 2
Cambridge Computers Z88
Acorn Archimedes 512 (upgraded to 2mb RAM and a hard drive)
RISC PC
Apple Performa 630
Apple Newton 2000
Apple eMate
G4 PowerMac (one of the first 400 MHZ models)
iBook (of the G3 Graphite SE varieties)
PS1
Game Cube
MegaDrive
Nintendo 64
Dreamcast
GameGear

A kind of mini museum really. Hmm...

Note - I am not counting kit in current use. Nor am I counting the 1970’s Atari console my other half’s brother gave her from her birthday (no, I don’t know why he did that either), though I suspect it’s become mine now