Apple II (1977) – One of the first successful personal computers, the Apple II was designed as a mass-market product rather than something for engineers or enthusiasts. It was still largely Wozniak’s design. Several upgrades for the model followed, and the product line continued until 1993. Photo: Flickr/Julio Martinez

Apple II (1977) – One of the first successful personal computers, the Apple II was designed as a mass-market product rather than something for engineers or enthusiasts. It was still largely Wozniak’s design. Several upgrades for the model followed, and the product line continued until 1993. Photo: Flickr/Julio Martinez