HP programmable calculators

thumb|HP-65 in original hard case with manuals, software "Standard Pac" of magnetic cards, soft leather case, and charger

programmable calculator

programmable graphing calculator

Series of Hewlett-Packard calculators

The HP-41C series are programmable, expandable, continuous memory handheld RPN calculators made by Hewlett-Packard from 1979 to 1990. The original model, HP-41C, was the first of its kind to offer alphanumeric display capabilities. Later came the HP-41CV and HP-41CX, offering more memory and functionality.

The HP-25 was a hand-held programmable scientific/engineering calculator made by Hewlett-Packard between early January 1975 and 1978. The HP-25 was introduced as a cheaper (US$195 MSRP) alternative to the ground-breaking HP-67. Similar to the way the HP-55 was a cheaper alternative to the HP-65.

Programmable scientific calculator produced by Hewlett-Packard

The HP-67 is a magnetic card-programmable handheld calculator, introduced by Hewlett-Packard in 1976 at an MSRP of $450. A desktop version with built-in thermal printer was sold as the HP-97 at a price of $750. Collectively, they are known as the HP-67/97.

The HP-42S RPN Scientific is a programmable RPN Scientific hand held calculator introduced by Hewlett-Packard in 1988. It is a popular calculator designed for science and engineering students.

Series of graphing calculators by Hewlett-Packard

thumb|right|300px|upright|HP-34C Calculator The HP-34C continuous memory calculator is an advanced scientific programmable calculator of the HP 30 series. It was produced between 1979 (cost US$150) and 1983 (cost US$100).

calculator series by Hewlett-Packard