Some of these comments are "my first HP". I bought an HP-28C in when I graduated from high school using my own money. It was $235 which was a lot of money for

Some of these comments are "my first HP". I bought an HP-28C in when I graduated from high school using my own money. It was $235 which was a lot of money for me. My parents thought I was crazy. I later upgraded to the 28S followed by the 48sx. At college, I would enter and win the "Calculator Olympics". They would give you these super complicated algebraic expressions to evaluate. The TI people would lose track of all the parentheses and the older HPs would exceed the 4-level stack. I was amused a couple years ago to discover many of my old programs are still preserved on the internet: https://www.hpcalc.org/authors/166 https://www.hpcalc.org/authors/166 POLY was hugely popular at the time. I just wrote it to simplify my classwork.