Mathematics Notes

HP-20S

I used a programmable Hewlett-Packard HP-20S scientific calculator in my high school math classes in the early 90’s.

It is still fine and functional here 30 years later and most importantly it is keystroke programmable. A couple of programs I did back then are documented below.

These are my first programs - besides BASIC programming on Commodore 64 and Comal80 in public school on a RC759 Piccoline in the 80’s.

Binomialfordelingen

Programs to calculate propabilities for binomialfordelingen

Bestemmelse af nulpunkter

Two programs to find roots (minima) in functions. One using Newtons metode and one using bisektion