Episode Details

Software is the only thing we build that we expect to throw away — yet some programs from the 1950s and 60s are still running the same jobs today. This episode digs into the strongest claims for the world's oldest production software: MOCAS, the 1958 Pentagon contract system; SABRE, the 1960 airline reservation system that cut booking time from 90 minutes to seconds; the IRS Individual Master File from 1962; and Voyager's 1977 flight computer, still taking commands from 22 light-hours away. Along the way, we untangle a distinction most coverage misses: a language still in use (COBOL) is not the same as software that has survived largely unchanged. Is this an engineering triumph or a warning sign? The answer depends entirely on which definition of "oldest" you're using — and whether the risk lives in the old code or in the rewrite. Key sources: • MIT Technology Review — https://www.technologyreview.com/2015/08/06/166822/what-is-the-oldest-computer-program-still-in-use/ • Guinness World Records — https://www.guinnessworldrecords.com/world-records/636196-oldest-software-system-in-continuous-use • Guinness World Records — https://www.guinnessworldrecords.com/world-records/635980-longest-period-of-continual-operation-for-a-computer Episode 5885 — myweirdprompts.com/n/5885 (permanent short link: myweirdprompts.com/399964)