News for hackers. Stuff that matters.

A comment on Apollo 11 Guidance Computer vs. USB-C Chargers. Parent comment

Re:Apollo 11 Guidance Computer vs. USB-C Chargers by jvm_ on Friday February 07, 2020 @05:05PM (#22271544)
The docking (like find your way back to the mothership radar) was still turned on, so the CPU was receiving the data and having to process it.

The CPU was throwing an I'm overloaded signal, but dealing with it, as the process priority put docking radar as less priority than the landing sequence.

So the CPU was complaining but still doing it's job.

All this is from memory :P

[ Parent | on HN ]
Re:Apollo 11 Guidance Computer vs. USB-C Chargers by dave_blob on Friday February 07, 2020 @05:19PM (#22271718)
Yes, just looked it up.

I was (partially) wrong about the un-synced frequency though. The synchro's for the docking radar ran from a different power circuit than the AGC, and whilst they were frequency locked they weren't in phase; resulting in timings getting thrown off and the priority issues.

Edit: Superb deep dive on AGC in Ars from last week https://arstechnica.com/science/2020/01/a-deep-dive-into-the...

[ Parent | on HN ]