These are a combination of my own, my brother's and my dad's computers. We all shared use of them:
ZX81 - Later upgraded memory to 16K I think, along with a cartridge that allowed for 'user defined graphics). The keys on this thing were great - huge blocks of clear plastic with a bit of paper stuck underneath. Remember playing Maziacs on it. I had my first taste of programming when I was 4. I got it to repeat my name over and over with a "Scroll?" appearing at the bottom. I think it was 3 lines, used a GOTO statement and was an infinite loop!
ZX Spectrum 48K - Ahh my nails! Typing on this was painful. - My dad reprogrammed this one to say (c)$$my dads name$$ 198* $$ instead of the usual Sinclair Spectrum copyright. Earliest game memories were Oligopoly and Knot in 3D.
ZX Spectrum 48K+ ( I got this one christmas along with a microdrive, which was awesome as I'd only used tapes before that and it was very fast - although quite unreliable)
ZX Spectrum 128K
ZX Spectrum 128K +3 Had a built in tape deck!
C64
C128D - Built in disk drive. This thing was a beast. Looked like a proper business PC but I used it solely for gaming. Had a big hole underneath for the wired keyboard to be stored - never really got the point of that.
Atari STFM - 512K later upgraded to 8 megs - used to raytrace on this thing. took ages but was blown away by the graphics.
Amiga 500 The games were great. Didn't have that many of them though.
... long break from computers for a few years ... then bought these ...
AMD K6-2 533,with Voodoo 2, Soundblaster Live (expensive one with front panel for bedroom musicians) - used it for making music and my first online FPS gaming - Quake 2. Was absolutely blown away by running round in 3D environments chatting to and shooting real people.
Had that one for ages.. Since then it's been a long upgrade procession including these chips and GPUs -
Celeron with 512MB and onboard graphics. I remember so little of this machine, not even the clockspeed - it underwhelmed me at every step. I think I've blotted it from my mind.
.... started building my own now ....
Winchester with 512MB and 5700LE (which OC'd like a monster - literally doubled the GPU clock - still slow as hell though)
Venice with 1.5Gigs and 5900XT, later 6600GT. Got some eDimensional shutter glasses to use with my CRT. Was magic playing Painkiller in 3D. Had to get rid of the CRT eventually though and replace it with an LCD so no more 3D gaming for me
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San Diego with 2 Gigs of really nice RAM - cost me over £200 as it was when RAM prices were being fixed. OCZ Platinum DDR500 eb. Those were the days of netburst and I used to love posting my RAM scores from programs like Everest and Sandra to the chagrin of Intel fanatics. I kept the 6600GT for a while but I swapped it out for a 7800GT when the 7 series arrived. That card kicked the pants out of BF2 which was my game of choice for so long. I really got into overclocking at this time (as you might have guessed by the choice of CPU and RAM) and first started to seriously consider power supplies (I had a great Hiper 580 Type R). The last upgrade I made to this machiine was the almighty X1900XT 512. My first ATI card and an absolute beast. I still get nostalgic about this build as I think it was the time I was most happy with my kit. Although it was a single core, there was so little need for duals at that time that I really felt I wasn't missing anything.
Kept the last system for ages. My dad still uses it as a server, which brings a small tear to my eye to think of it locked away in a virtual cupboard like that.
Intel Core2Duo E6600 with 4 gigs Corsair RAM and 8800GTX. From this point on things were so smooth for so long that I almost entirely forgot about the hardware in my case. I still have this build today. Eventually I upgraded to a 4870 1 gig but on the whole I was underwhelmed by the improvement in performance even in 19x12 res (at the time). It was no big jump like the previous iterations all had been. It's great to see the 8800GTX still knocking out playable framerates today even at high res. I still have that card - I haven't the heart to sell it. Now though, in newer games I certainly get the benefit of the 4870 - or at least I did until I replaced it with a GTX285 about a month ago.
I don't tend to go for smaller jumps in performance so the GTX purchase was quite out of character for me especially considering my initial reactions with the 4870. The reason I did it though was to get stereoscopic gaming back on the go and I have to say the magic and wonder I once had with PC gaming has returned thanks to this technology. I can't wait until ATI offer a solution too, and it really takes off.