• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
TechBill Gates

Bill Gates offers to let anyone download the first operating system he and Paul Allen wrote 50 years ago: ‘That code remains the coolest I’ve ever written’

By
Michael Liedtke
Michael Liedtke
and
The Associated Press
The Associated Press
Down Arrow Button Icon
By
Michael Liedtke
Michael Liedtke
and
The Associated Press
The Associated Press
Down Arrow Button Icon
April 3, 2025, 5:19 AM ET

Even as he grows older, Microsoft founder Bill Gates still fondly remembers the catalytic computer code he wrote 50 years ago that opened up a new frontier in technology.

Recommended Video

Although the code that Gates printed out on a teletype machine may look crude compared to what’s powering today’s artificial intelligence platforms, it played a critical role in creating Microsoft in April 1975 — a golden anniversary that the Redmond, Washington, company will celebrate on Friday.

Gates, 69, set the stage for that jubilee with a blog post reminiscing on how he and his old high school friend — the late Paul Allen — scrambled to create the world’s first “software factory” after reading an article in the January 1975 issue of Popular Electronics magazine about the Altair 8800, a minicomputer that would be powered by a tiny chip made by the then-obscure technology company, Intel.

The article inspired Gates, who was just a freshman at Harvard University, and Allen to call Altair’s maker, Micro Instrumentation and Telemetry Systems, and promise the company’s CEO Ed Roberts they had developed software that would enable consumers to control the hardware. There was just one hitch: Gates and Allen hadn’t yet come up with the code they promised Roberts.

Gates and Allen tackled the challenge by latching onto the BASIC computer language that had been developed in 1964 at Dartmouth College, but they still had to figure out a way to make the technology compatible with the forthcoming Altair computer, even though they didn’t even have a prototype of the machine.

After spending two months working on the program with little sleep, Gates finished the code that became the basis for the Altair’s first operating system. “That code remains the coolest I’ve ever written,” Gates wrote in his blog post, which includes an option to download the original program.

The code would go on to provide the foundation for a business that would make personal computers a household staple, with a suite of software that include the Word, Excel and PowerPoint programs, as well as the Windows operating system that still powers most PCs today.

“That was the revolution,” Gates said of the code in a video accompanying his post. “That was the thing that ushered in personal computing.”

Gates’ recollection of the code is part of a nostalgic kick that he has been on this year as he prepares to turn 70 in October.

The trip down memory lane included the February release of a memoir exploring his early years as an often-misunderstood child with few friends, and a hailing of the 25th anniversary of the philanthropic foundation he created after stepping down as Microsoft’s CEO in 2000. The tech giant initially stumbled after Gates’ departure but has been thriving under CEO Satya Nadella, and has amassed a market value of about $2.8 trillion.

In his memoir, Gates also reflected on his tempestuous relationship with fellow PC pioneer, the late Apple co-founder Steve Jobs, whose company will be celebrating its golden anniversary next year.

“Fifty years is a long time,” said Gates, whose personal fortune is estimated at $108 billion. “It’s crazy that the dream came true.”

Join us at the Fortune Workplace Innovation Summit May 19–20, 2026, in Atlanta. The next era of workplace innovation is here—and the old playbook is being rewritten. At this exclusive, high-energy event, the world’s most innovative leaders will convene to explore how AI, humanity, and strategy converge to redefine, again, the future of work. Register now.
About the Authors
By Michael Liedtke
See full bioRight Arrow Button Icon
By The Associated Press
See full bioRight Arrow Button Icon

Latest in Tech

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Tech

bespectacled man scratches the back of his head during congressional hearing
CryptoCryptocurrency
Kalshi locks in $22 billion valuation, gaining slight edge over its rival Polymarket
By Carlos GarciaMarch 20, 2026
2 hours ago
Big TechEntrepreneurs
Mark Cuban reads 1,000 emails a day—now he’s using a Mac Mini to fight the AI-generated flood threatening his clean inbox obsession
By Marco Quiroz-GutierrezMarch 20, 2026
3 hours ago
Stressed out job seeker on laptop
Successjob hunting
Job seekers aren’t imagining things: the number of candidates ghosted by employers just reached a three-year high thanks to AI
By Emma BurleighMarch 20, 2026
6 hours ago
SuccessCareers
AI boom is fueling demand for skilled trades—and demand for technicians, HVAC workers, and electricians is soaring, with six-figure salaries to match
By Preston ForeMarch 20, 2026
7 hours ago
LawX
Three Tennessee teenagers are suing Elon Musk’s xAI for creating sexually explicit images of them
By The Associated Press and Travis LollerMarch 20, 2026
8 hours ago
Trump standing waving hi at a crowd
AIDonald Trump
The White House has a plan for AI regulation, and it starts with keeping states out of it
By The Associated Press and Seung Min KimMarch 20, 2026
9 hours ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.