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Bill Gates Celebrates Microsoft’s 50th Anniversary by Sharing Legendary Altair BASIC Source Code

Microsoft’s 50th anniversary is a momentous occasion, marking five decades of technological innovation, world-changing software, and digital advancements. To celebrate this milestone, Bill Gates, the visionary co-founder of Microsoft, has shared a piece of history that played a pivotal role in the company’s origins: the original Altair BASIC source code.

A nostalgic look back at the code that launched Microsoft: Altair BASIC, written by Bill Gates and Paul Allen.
In a heartfelt post on his Gates Notes blog, Gates reminisces about the early days of Microsoft and the software that launched it into the world of tech giants. “Before there was Office, or Windows 95, or Xbox, or AI, there was Altair BASIC,” Gates writes, reflecting on the pivotal role this early piece of code played in shaping the future of computing.

The Coolest Code Gates Ever Wrote

For Gates, the release of Altair BASIC holds a special place in his heart. Describing it as "the coolest code I've ever written," he looks back fondly on the sleepless nights spent working alongside his co-founder Paul Allen. Gates recalls how the inspiration for the code came from a January 1975 issue of Popular Electronics, which featured the Altair 8800 microcomputer on its cover. This microcomputer, developed by MITS (Micro Instrumentation and Telemetry Systems), was a game-changer and would soon serve as the catalyst for the creation of Microsoft. The Altair BASIC interpreter that Gates and Allen developed allowed users to easily write their own programs for the Altair 8800. This, in essence, brought computing to the masses, making personal computers accessible in ways they hadn't been before. At the time, there was little expectation that software could become as important as hardware, but Gates and Allen’s vision helped pave the way for the computing revolution.

Microsoft’s Humble Beginnings

Before Microsoft became the software behemoth it is today, the company was known as Micro-Soft, a name Gates and Allen used when they first started working on the Altair BASIC interpreter. The name would later be simplified to just “Microsoft,” but the spirit of that original idea still drives the company today. The journey was no easy feat, and Gates recalls the hard work that went into developing Altair BASIC. “Paul and I spent sleepless nights for months on end trying to develop the code,” Gates shares. The duo worked tirelessly to bring their vision to life, sometimes claiming that the software was already complete before it was even written. Their hustle paid off, and Altair BASIC became the first major product for Microsoft.
The Altair 8800 microcomputer, featured on the cover of Popular Electronics in 1975, inspired Bill Gates and Paul Allen to create Altair BASIC.
Gates also shares a memorable moment of holding up a foot-long piece of paper with the code printed on it, encapsulating the tangible results of their hard work. This iconic moment became a defining image of the company’s early days and serves as a reminder of how far Microsoft has come since those humble beginnings.

A Major Milestone for Microsoft

As Gates celebrates this milestone, he also acknowledges the key players who have contributed to Microsoft’s success over the years. He credits former leaders like Steve Ballmer and Satya Nadella for continuing the company’s tradition of innovation, as well as the many employees who have helped shape the tech giant over the decades. “Making it 50 years is a huge accomplishment,” Gates writes. “We couldn’t have done it without incredible leaders and the many people who have worked at Microsoft over the years.” Gates' decision to share the Altair BASIC source code is an interesting and fitting tribute to Microsoft’s roots. As tech journalist Thurrott puts it, it’s "the most Bill Gates way possible" to mark the occasion. Indeed, this move exemplifies Gates’ love for the history of computing, showing a deep respect for the journey that started it all.

How to Access the Source Code

For those eager to dive into the code that started it all, Gates has made the Altair BASIC source code available for download. While it may not be the most thrilling read for the casual audience, it’s a piece of history that offers insight into the development process and the early days of personal computing. The full source code spans 157 pages, and while it might not be the easiest thing to parse for the uninitiated, it’s a fascinating look at the foundational steps that led to the creation of the tech powerhouse we know today.
Bill Gates fondly remembers Altair BASIC as 'the coolest code I’ve ever written' on the 50th anniversary of Microsoft.

Legacy of Innovation and the Road Ahead

Looking back on Microsoft’s 50-year journey, Gates reflects on the impact the company has had on the world. From its early days working with the Altair 8800 to the development of Windows, Office, and Xbox, Microsoft has played a crucial role in shaping the modern computing landscape. Today, the company continues to innovate with advances in artificial intelligence, cloud computing, and more, maintaining its position as one of the most valuable companies in the world. As we celebrate 50 years of Microsoft, Gates’ sharing of Altair BASIC serves as a nostalgic reminder of how far the company has come. The early days may have been humble, but the vision was grand. Microsoft’s success is a testament to the power of innovation and the belief that computers could change the world—one line of code at a time.

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