50 years after the founding of Microsoft, Bill Gates has now published the entire source code of Altair Basic, the software that laid the foundations for the billion-dollar company. To this day ...

And the fun isn't over yet! To commemorate the special occasion, Microsoft's co-founder Bill Gates has joined the fray and shared the source code that shaped the company's origins — Altair BASIC.

Altair Basic was developed by Gates, fellow Microsoft co-founder Paul Allen, and programmer Monte Davidoff. The trio reportedly coded “day and night for two months” in 1975.