An extensive collection gathered from all over the internet of the source code and documentation for NASA’s Apollo and Gemini programs. Here’s part of the source code for Apollo 11’s guidance computer.
And here’s an interesting tidbit about the core rope memory used for the Apollo’s guidance computer:
Fun fact: the actual programs in the spacecraft were stored in core rope memory, an ancient memory technology made by (literally) weaving a fabric/rope, where the bits were physical rings of ferrite material.
“Core” memory is resistant to cosmic rays. The state of a core bit will not change when bombarded by radiation in Outer Space. Can’t say the same of solid state memory.
Woven memory! Also called LOL memory:
Software written by MIT programmers was woven into core rope memory by female workers in factories. Some programmers nicknamed the finished product LOL memory, for Little Old Lady memory.