Altair 8800 launches on magazine cover and ignites the personal computer era

Story: 1975 C.E.  |  Last updated: January 1, 1975

A mail-order kit with no screen, no keyboard, and no software anyone could easily run sold out almost instantly — and in doing so, it changed the world. When the January 1975 C.E. issue of Popular Electronics hit newsstands in December of 1974 C.E. with the Altair 8800 on its cover, it set off a chain reaction that would eventually put a computer in nearly every home, pocket, and pocket-sized device on Earth.

Key facts

• Altair 8800: Introduced by Micro Instrumentation and Telemetry Systems (MITS) in 1975 C.E., it was built around the Intel 8080 processor and sold as a kit for around $395 — roughly $2,500 in today’s money — through hobbyist magazine advertisements.
• Personal computer revolution: According to computing pioneer Harry Garland, the Altair 8800 was the single product that catalyzed the microcomputer revolution of the 1970s C.E., spawning an entire industry of hardware standards, software companies, and user communities.
• Altair BASIC: The machine’s first programming language was written by a young Paul Allen and Bill Gates, and it became Microsoft’s founding product — one of the most consequential pieces of software ever written.

A kit born from desperation

The Altair’s origin story is not one of flush corporate investment. Ed Roberts, the engineer who built it, was running MITS out of a garage in Albuquerque, New Mexico, and was carrying roughly $250,000 in debt after Texas Instruments had undercut the calculator market MITS depended on. Building a personal computer was, as Roberts later put it, a last-ditch attempt to save the company.

Roberts chose the Intel 8080 chip, then priced at $360 per unit, as the heart of the machine. He negotiated a bulk deal with Intel for chips at $75 each — a price that made the kit economically possible. The prototype was shipped to Popular Electronics in New York via Railway Express Agency, but it never arrived due to a shipping strike. The computer on the famous magazine cover was an empty box with switches and LEDs and nothing else inside.

None of that mattered. MITS was flooded with orders.

What made it different

Several microcomputers existed before the Altair 8800. France’s R2E company had marketed the Micral in 1973 C.E. Canada’s Micro Computer Machines had produced the MCM/70 by 1974 C.E. These were real machines, and their contributions to computing history deserve recognition. What the Altair did differently was reach a mass audience of hobbyists through the pages of a magazine they already trusted, at a price point they could argue with themselves into paying.

It arrived not as a finished product but as an invitation. You had to build it. You had to figure it out. And tens of thousands of people wanted exactly that.

The machine had no monitor output by default. Users programmed it by flipping switches on the front panel and reading binary output from blinking LEDs. To get anything more sophisticated, you needed add-on cards. The S-100 bus that Roberts designed for those expansions became the first de facto hardware standard in personal computing — a foundational concept that would echo through every desktop architecture that followed.

The software that came with it

In early 1975 C.E., a 19-year-old Bill Gates read about the Altair in Popular Electronics and called MITS to say he and his partner Paul Allen had already written a version of BASIC for the machine. They hadn’t. They wrote it in the weeks that followed, working from an Intel 8080 manual and an emulator running on a Harvard mainframe.

It worked on the first try when Allen flew to Albuquerque to demonstrate it. MITS licensed the software. Gates and Allen named their partnership Micro-Soft. The rest of that story is well known — but it began here, with a machine that had no software until two young men decided to write some.

The Homebrew Computer Club and the culture it built

The Altair 8800 also ignited a community. The Homebrew Computer Club, which held its first meeting in a Menlo Park garage in March 1975 C.E., was founded in direct response to the Altair’s appearance. Members shared schematics, debated architectures, and pushed the technology forward faster than any single company could have. Among its regulars were Steve Wozniak and Steve Jobs.

The club embodied an ethos of open sharing that shaped early computing culture in ways both lasting and complicated. Gates famously wrote his “Open Letter to Hobbyists” in 1976 C.E., arguing that freely copying software — a common Homebrew practice — was theft. The debate he kicked off about open versus proprietary software has never fully ended.

Lasting impact

The Altair 8800 established that ordinary people — not just corporations and universities — would buy and use computers. That insight was not obvious in 1975 C.E. Mainstream technology companies largely dismissed the hobbyist market. MITS and the community it galvanized proved them wrong.

Within three years, Apple, Tandy, and Commodore had all released mass-market personal computers. Within a decade, IBM had entered the market and Microsoft had licensed its operating system to run on IBM’s machines. The cascade of consequences that followed — the spreadsheet, the word processor, the internet browser, the smartphone — traces back, through many hands and many decisions, to a switched-panel box that appeared on a magazine cover and never quite worked the way the article said it would.

The Smithsonian Institution holds an original Altair 8800 in its collection. So does the Computer History Museum in Mountain View, California, where it is displayed as one of the pivotal objects in the story of modern technology.

Blindspots and limits

The Altair revolution was overwhelmingly a phenomenon of white, male, English-speaking hobbyists with disposable income and technical training — a demographic skew that shaped which problems early personal computing tried to solve and whose needs it centered. The machines that followed carried those assumptions forward in ways the industry is still grappling with. The pioneers of this era also rarely acknowledged the earlier microcomputer work done in France and Canada, a gap in the standard American-centric telling of computing history that is worth naming.

Read more

For more on this story, see: Wikipedia — Altair 8800

For more from Good News for Humankind, see:

• Renewables now make up at least 49% of global power capacity
• Global suicide rate has fallen by 40% since 1995
• The Good News for Humankind archive on technology

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