Hmm, not strictly all in order but I think it was:
ZX81 -> VIC20 -> Spectrum 48K -> C64 -> A1000 -> A2000 -> CDTV -> CD32 -> A3000 -> Pentium 75 PC ... Then PC only for many years.
Also had a side order of Atari 2600, PS1, PS2, PS3 and lately (for the kids) Wii-U
In later life then started collecting it all again; At one point had A1000, A2000, A3000, A4000, A500, ZX81, Spectrum 48K, C64, VIC20, Atari 2600, Intellivision
Now down to A1000, A3000, ZX81, C64, VIC20, Atari 2600, Intellivision. Intellivision probably next on list to go, probably keep the rest.