hmm, the earliest game I remember playing was Galaxians, on the ZX81. That'd be back in... 1982 or 1983. Wasn't long after that I moved to the Spectrum and games like Skull and 3D Deathchase. Fond memories of Pyjamarama, Jet Set Willy, and all the rest on the old squishy-keyed Spectrum.
After that, it was onto the BBC, then Amstrad, Sam Coupé, and AtarI ST before reaching the PC. First PC game I ever played was Megarace, because it came with the pooter (We bought a Packard Bell). At the time, I remember being blown away by the graphics, and the concept of full motion video in a game (the delightful "host" Lance Boyle).
Will, how times have changed!