Microsoft has made available the source code for an early version of BASIC developed back in 1976. This code was originally created for the MOS 6502 processor, which powered many of the first home computers. Now, version 1.1 of this classic code is out on GitHub, and it’s licensed under the MIT license, meaning anyone can view and use it freely.

This release is a big deal for tech history buffs and programmers interested in vintage systems. The code is quite extensive, spanning about 6,955 lines of assembler. It includes a full implementation of BASIC that supports floating-point numbers, strings, arrays, math functions, and input/output operations. It’s optimized for 8-bit systems, making it a good resource for those interested in how early home computers worked.

The Roots of Microsoft’s Early Success

The story begins in 1975 when Bill Gates and Paul Allen created BASIC for the Altair 8800, one of the first personal computers. They used the Intel 8080 processor for that version. The following year, they ported the language to the MOS 6502 processor, which was used in many popular machines of the era.

In 1977, Commodore licensed this BASIC version for $25,000. It found its way into several of their computers, including the PET, VIC-20, and the famous Commodore 64. These computers sold millions of units worldwide, helping to bring personal computing into homes and schools. The availability of BASIC on these machines played a key role in introducing many people to programming.

The Vintage Code Offers a Glimpse Into Computer History

The newly released code isn’t just a nostalgic artifact; it’s a functional piece of software. It supports classic computers like the Apple II, Ohio Scientific, and the MOS KIM-1, making it a useful resource for enthusiasts and programmers who want to understand or emulate early systems. The code includes support for essential features such as math functions, string handling, and memory management—crucial for running programs on 8-bit hardware.

Adding a fun touch, Microsoft included a playful Easter egg in the code. There’s a hidden reference to Bill Gates in the form of labels named STORDO and STORD0, which is a nod to the company’s roots and early days. The release also highlights how open source principles can help preserve and study the roots of modern computing. It’s a reminder of how far technology has come and offers a chance for new generations to explore the roots of programming.

In summary, Microsoft’s release of this vintage BASIC code provides a valuable window into the early days of personal computing. Whether for educational purposes, hobby projects, or historical interest, having access to this classic code is a fascinating way to connect with the roots of modern software development.

Inspired by

• https://www.computerworld.com/article/4051500/bill-gates-early-basic-code-for-6502-released-as-open-source.html

Sources

• gmpg.org
• theregister.com
• github.com
• microsoft.com
• podigee.com