The Apollo Guidance Computer's software was designed to interrupt a lower-priority task in order to handle a more important one.
Sources
- Margaret Hamilton Led the NASA Software Team That Landed ... (smithsonianmag.com)
- https://www.kroneckerwallis.com/the-apollo-guidance-computer-how-1960s-software-landed-on-the-moon/ (kroneckerwallis.com)
- https://www.discovermagazine.com/apollo-11s-1202-alarm-explained-185 (discovermagazine.com)
- https://spacedaily.com/t-apollo-11-1201-1202-guidance-computer-restarts/ (spacedaily.com)
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