The first game of this genre was written for the Commodore PET by Peter Calver and published under the name Air Attack by his company, Supersoft, in 1979. At that time it was common for computer magazines to publish games listings which readers could type into their own computer, and Air Attack was also published as a listing in the December 1979 issue of Personal Computer World.
For a short period a 4-coloured transparent overlay was available which simulated colour on the black-and-white screen of the PET computer (a similar technique had previously been used in some arcade machines, notably Breakout). However, when Commodore switched from black-and-white to green screens the effect was no longer as convincing, and the overlay was discontinued.
Although the game was inspired by a verbal description of the arcade game Canyon Bomber (Atari, 1977), it was not until many years later that Peter Calver saw the original game. The inspired change from a canyon filled with rock pillars to a city of skyscrapers was copied by all later clones including Blitz, City Bomber and City Lander (for ZX Spectrum, C64 and ZX-81). 'Blitz' was published by Commodore themselves for the Vic-20, then Blitz-64 for the Commodore 64 and Blitz-16 for the Commodore-16. Blitz was taken by Commodore from 'Vic New York' written by Simon Taylor.