I voted Atari 400/800, but mine was actually a 600. It's in parts but I still have it.
in reply to My first computer was...
I do have a working Commodore 64 and several working 286, 386, 486, Pentium, and K6 class PCs. I have had Amigas, Apple II's, Macs, etc. I currently have a few old computers not on the list, too. A Sun SparcServer 600 and a Cado Systems Tiger 16 are my prized obsolete systems. I really enjoy collecting older systems.
My current somewhat recent systems are all AMD based, but I'm considering getting a used Powerbook, iBook, or Sparcbook.
Christopher E. Stith