Properties of a Pocket Calculator for Astronauts

[deetee]

Thanks for sharing this lot of knowledge and thoughts - which I want to summarize (please complete):

HARDWARE:

• Display: LED/OLED displays seem to be very resistant (operating temperatures from -40 to +85 Celsius) and better than LCD displays. I remember Mark Watney's dying laptop on Mars but I also saw Sandra Bullock's LCD wrist watch working well in Earth's orbit. Apollo's AGC worked with 7 segment LED displays (5 digits).
• Keyboard: Less and big keys - simple to understand/operate
• Case: Plastic/Metal? Velcro strips?
• Clock/Time Module: for alarms, timers, ...
• Interface: Serial? - display signals
  

SOFTWARE:

• Acquisition and display of signals
• Time/Alarm/Timer/Stopwatch
• Oxygen calculations
• Center of gravity (What for?)
• Orbit calculations (Kepler's equation)
• Landing, Reentry calculations
• Trajectories
• Proximity Operations
• Tail - course deviation calculations
• Payload arm operations
  

I'm looking now for more details to this kind of software. In Gene222's link to "Introduction to Orbital Flight Planning" are a lot of HP-specific programs. But I saw that this is not easy to follow and deeper knowledge in Physics and Math is required. Is there some "Space Flight Theory and Math for Dummies"?

Regards
deetee