Credit: phreakindee/Wikimedia CommonsLate last week, Microsoft released the complete source code for Microsoft BASIC for 6502 Version 1.1, the 1978 interpreter that powered early personal computers like the Commodore PET, VIC-20, Commodore 64, and Apple II. Microsoft BASIC was millions of people's first programming experience in the late 1970s and early 1980s. That deal helped millions of Commodore computers ship with Microsoft software at no further cost, a decision that later benefited Commodore and limited Microsoft, Ars Technica reports. But funnily enough, the code includes documented Easter eggs attributed to Bill Gates, like the famous WAIT 6502,1 command. By offering official access to BASIC, Microsoft is helping preserve a piece of computing history.