I read through Don Eyles apollo memoir Sunburst and Luminary- great book. In the book he describes their simulator for the lunar landing (essentially a test har

I read through Don Eyles apollo memoir Sunburst and Luminary- great book. In the book he describes their simulator for the lunar landing (essentially a test harness for the landing code) which consisted of inputs of coordinates and speeds, and gave printed output of thrust changes and expected position over time. Mind blowing for someone so used to visual representations.