The Calculator Scientific Calculator was an RPN (Reverse Polish Notation) calculator that was popular with engineers back in the and it was manufactured from 1981 through It was a programmable calculator that had built-in support for c
I love my TI89 Titanium, but my 1st scientific was an HP15C. I love the reverse polish notation of the HP's. I found this HP48GX at a flea market in my hometown this week for 25$. Price on Amazon? $150.00 !!!!!
Hewlett-Packard's HP has inspired uncanny loyalty among a generation of financial-industry pros who have grown up with the instrument and its quirky features—such as "reverse Polish notation"—and who relish its snob appeal.
HP Scientific Calculator by Hewlett Packard. More than 100 built-in math and science functions. Powerful built-in program library. Essential trig and math functions. Base conversions and arithmetic. Data entry using reverse Polish notation.