Altair 8800 computer based on the improved Intel 8080 processor. The January 1975 issue of Popular Electronics had the Altair computer on the cover and this launched the home computer revolution. (However, Walter Isaacson's biography of Steve Jobs incorrectly identified the magazine that ran the article as Popular Mechanics.) The magazine was digest size () for the first 20 years. The cover logo was a sans-serif typeface in a rectangular box. The covers featured a large image of the feature story, usually a construction project. In September 1970 the cover logo was changed to an underlined serif typeface. The magazine's content, typography and layout were also updated. In January 1972 the cover logo added a second line, "including Electronics World", and the volume number was restarted at 1. This second line was used for two years. The large photo of the feature project was gone, replaced by a textual list of articles. In August 1974 the magazine switched to a larger letter size format (). This was done to allow larger illustrations such as schematics, to switch printing to offset presses, and respond to advertisers desire for larger ad pages. The longtime tag line, "World's Largest Selling Electronics Magazine", was moved from the Table of Contents page to the cover. Personal computers There is debate about what machine was the first personal computer, the Altair 8800 (1975), the Mark-8 (1974), or even back to Kenbak-1 (1971). The computer in the January 1975 issue of Popular Electronics captured the attention of the 400,000 or so readers. Before then, home computers were lucky to sell a hundred units. The Altair sold thousands in the first year. By the end of 1975 there were a dozen companies producing computer kits and peripherals using the Altair circuit bus, later renamed the S-100 bus and set as an IEEE standard. The February 1975 issue featured an "All Solid-State TV Camera" by three Stanford University students: Terry Walker, Harry Garland and Roger Melen. While the Cyclops Camera, as it was called, was designed to use an oscilloscope for the image display, the article mentions that it could also be connected to the Altair computer. It soon was, the authors got one of the first Altair computers and designed an interface for the camera. They also designed a full color video display for the Altair, "The TV Dazzler", that appeared on the cover of the February 1976