This is the code in the Apollo Guidance Computer for Apollo 11.
It’s part of the LUMINARY sofware, which ran on the AGC on the Lunar Module. It’s meant to check if the landing radar is pointed toward the lunar surface - because the LM went through several orientations, the landing radar could be pointed to the front or the side or down. You’re landing on the Moon. Point it down.
Point is, you have to verify user input. Even if your users are the most meticulous and highly trained individuals in history. You have to see if they’re lying. So you get to the BURNBABY.
Browse the code in GitHub - this code is in THE_LUNAR_LANDING.agc
Cosmopolitan.
I was going to rejoinder this with a quip about ‘presumably neither shaken nor stirred’, but given that this was clever enough to stunlock me for ~12 hrs, I guess just ‘bravo!’
I was deathly afraid it wasn’t as clever as I thought. One however does one’s best.