In my detective work, I was beginning to wonder if I would find any other HP calculators related to the US space program (or any other national space programs for that matter). I just dug a little deeper into NASA’s Technical Reports server and came up with a few softwares written during the development phase of the space shuttle.
Here’s an interesting tidbit from a “fan” website dedicated to the HP-9825A:
“Except that 30 years later, well into the 21st century, NASA, DOD contractors, and calibration labs are still using HP 9825 desktop computers because the machines continue to work well and because no one wants to port the HPL software from these machines to newer computers. Crisis Computer in San Jose, CA continues to support the machine.“