Pick up a copy of Digital Retro, The Evolution and Design of the Personal Computer by Gordon Laing. It's by Sybex ISBN: 0-7821-4330-X.
It's a fantasic book and it will bring back many good memories of that first computer. It covers about 44 computers/game consoles with colour photos, technical specs, company history and interesting trivia.
Includes lesser known (in my opinion) systems like the Tatung Einstein TC-01, Oric-1, Jupiter Ace and the Grundy NewBrain.