[Yo-Yo]

I never could get the hang of RPN.

I was a TI man through and through. I saved up my pennies and bought a programmable TI SR-52 while I was in High School, 1977.

I wrote a couple of games based on physics equations we learned in HS Physics. They were rip-offs of BASIC games: Battleship, and Lunar Lander.

with Battleship, you were given a random distance to the enemy ship, and you had to input an elevation for the main gun. You shot, then the calculator would display how far your shell fell short or beyond your target, or if you hit. Once you hit it, it would display how many shots it took.

With lunar lander, you were given an altitude and vertical velocity, and fuel quantity. You entered a thrust amount from zero to 100. Then the calculator would give you a new altitude and vertical velocity, and new fuel amount. The object was to get altitude to zero within a narrow vertical velocity, before running out of fuel.

You really had to use your imagination when all you saw were digits.

[Mr.Unique]

I was a TI man through and through

Me too. A slide rule and a TI-30 got me through High School. A TI-55 got me through college.

[Redcitizen]

I actually did play lunar lander on an arcade machine. There was a little lander, lunar terrain and a flight path to control with levers and a button for thrust. I never could get it to land but ended up crashing. The graphics were on a par with Asteroids and Missle Commander.