ComputingFebruary 6, 1975 · Albuquerque, New Mexico, USA

Altair 8800 Sparks Home Computing

Popular Electronics' February 1975 issue featuring the Altair 8800 hit newsstands, igniting the personal computer revolution and inspiring Bill Gates and Paul Allen to found Microsoft.

The Altair 8800, a build-it-yourself kit built around Intel's 8080 microprocessor and sold by MITS for under $400, appeared on the cover of Popular Electronics' February issue. Hobbyists flooded MITS with orders, and the machine's success prompted two young programmers, Bill Gates and Paul Allen, to write a BASIC interpreter for it, launching the company that became Microsoft.

Ed Roberts, an Albuquerque engineer running the struggling calculator company MITS, gambled the firm's future on a cheap computer kit built around Intel's new 8080 chip. He needed a splash, and Popular Electronics editor Les Solomon gave him one, putting a mockup of the machine on the magazine's cover (the actual prototype hadn't even arrived in time for the photo shoot).

The response overwhelmed MITS: readers mailed in checks for a machine that arrived as a box of parts requiring painstaking soldering, with no keyboard, screen, or software — only switches and blinking lights to program it in raw machine code. Still, thousands of orders poured in from hobbyists hungry to own a computer of their own for the first time.

In Cambridge, Massachusetts, Harvard student Bill Gates and his friend Paul Allen saw the cover and recognized their opening. They wrote a version of the BASIC programming language for the Altair without ever having touched the actual hardware, testing their code on a simulator, then flew to Albuquerque to demonstrate it. It worked. Within weeks they founded Micro-Soft, and the personal computer industry was born from a magazine cover and a leap of faith.

Key people: Ed Roberts, Bill Gates, Paul Allen, Les Solomon

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