If you are a developer and interested in the short history of computer programming - then you owe it to yourself to watch Robert Wills talk on the Apollo Guidance Computer (AGC).  In the talk "Light Years Ahead | The 1969 Apollo Guidance Computer" he describes the journey he learned about - landing on the moon. It is all about the AGC and covers just enough of the details to give anyone the sense of accomplishment that this trip was.  The star of the talk is the AGC and the protagoniost is the 1202 Alarm - which signals a fault and recovery reboot.  Something you may still do today with your PC...  but not at 2000 feet above a Moon in the Lander.

Smarter Every Day - with Luke Tally

I Asked An Actual Apollo Engineer to Explain the Saturn 5 Rocket - Smarter Every Day 280

This extended video cut of talking to Luke about the Saturn and it's control computer is awesome.

Restorers Try to Get Lunar Module Guidance Computer Up and Running | WSJ

Here is another great story.  "In 1976 in a warehouse in Texas, Jimmie Loocke bought two tons of scrapped NASA equipment. Years later he realized it included a computer from an Apollo lunar module, like the one used to guide the lander to the surface of the moon during Apollo 11. Fifty years after that mission, computer restoration experts in Silicon Valley are trying to get his computer working again."

Years later NASA got a call from Apollo 14 about a warning light.  Digging into the diagnostics... a young computer wiz Don Eyles was called in to work the problem.  He created several procedures that allow the astronauts to hack the AGC.  Here is a great video by Scott Manley - The computer Hack that Saved Apollo 14.

Here is Scott Manley's video
The Four Computers That Flew Humans To The Moon