type calculator
country USA
year 1987
os HP
ram 32 KB
The HP 28S — Advanced RPN Scientific Calculator
The HP 28S, released in 1988, was one of the most powerful handheld calculators of its era — featuring a two-line display, symbolic algebra capability, and an extensive library of mathematical functions for engineers and scientists. Using HP’s RPL (Reverse Polish Lisp) programming language rather than the traditional RPN of earlier HP calculators, the 28S could handle symbolic mathematics, list processing, and user-defined functions with a sophistication that competing calculators could not match. HP’s scientific calculators were considered essential tools for engineering students and professionals worldwide.