While digging around looking for some letter sized file folders, I came across this ancient gem. An HP 11C scientific calculator. I remember getting this and thinking I finally had a calculator that could help me do engineering calculations. Look at all the multifunction buttons. What more could anyone want? RPN (Reverse Polish Notation). That means to add say the numbers 3 and 5, you didn’t key in the 3, hit the plus sign and enter the 5 followed by an equils sign. You entered the 3 entered the 5 and then pushed the + key. I know it seems silly, but you didn’t need parentheses this way. This was hot stuff at the time. It used an LCD display. No power hungry LEDs requiews. I was really surprised that after all these years, it still had power to work. You will notice that at some time I had lost the little door that covered the batteries and used my engineering skills to design a masking tape replacement. You know what was really special about this calculator, it was programable!d Wow... something that would fit in your pocket that was programmable. Imagine that. It was almost like a computer.












