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In the 1970s, Gates and his Microsoft co-founder, Paul Allen, used a computer in Harvard's lab to compose what he calls the 'coolest code I've written.' It's now public for the first time.

This is a three-part video series, documenting how [Ben Eater] ports a 1977 version of MS BASIC to his 6502-based computer. The first video is all about just getting the BASIC up and working.

Given that the system has a Z80 CPU and there’s little information in the manual about this programming language, [Robin] was suspicious as to whether it was based on Microsoft BASIC-80.

Today, BASIC remains popular in hobbyist retrocomputing circles, but few use it as a practical language. And yet it never truly died out—instead, it continued to evolve.

Ahead of Microsoft's 50th anniversary this week, co-founder Bill Gates has released the company's original source code. Gates and Paul Allen wrote it in BASIC using a PDP-10 mainframe at Harvard.