Misplaced Pages

The HP-22 was a finance-oriented pocket calculator produced by Hewlett-Packard between 1975 and 1978. It was designed as a replacement for the short-lived HP-70, and was one of a set of three calculators, the others being the HP-21 and HP-25, which were similarly built but aimed at different markets.

As with most HP calculators then and now, the HP-25 used RPN entry logic, with a four-level stack. It also had ten user-accessible memory registers. As was normal at the time, memory was not preserved on power-down. Its principal functions were (1) time value of money (TVM) calculations, where the user could enter any three of the variables and the fourth would be calculated, and (2) statistics calculations, including linear regression. Basic logarithmic and exponential functions were also provided. For TVM calculations, a physical slider switch labelled "begin" and "end" could be used to specify whether payments would be applied at the beginning or end of periods. It had a 12-digit LED display. A shift key provided access to functions whose legends were printed on the faceplate above the corresponding keys.

Its HP development codename was Turnip, and it was a member of the Woodstock series. Its US price was $165 in 1975, $125 in 1978.

A version adapted to support an additional backward-facing display manufactured by Educational Calculator Devices named EduCALC 22 GD existed as well.

References

1. Hicks, David G. "HP-22". Museum of HP Calculators. Archived from the original on 2017-05-24. Retrieved 2014-07-12.
2. "Hewlett-Packard Journal, November 1975" (PDF). Hewlett-Packard. November 1975. Archived (PDF) from the original on 2012-05-20. Retrieved 2014-07-12.
3. Thimet, Tony. "Hewlett Packard HP-22". Archived from the original on 2013-04-29. Retrieved 2014-07-12.
4. "The EduCALC". 65 Notes. Vol. 3, no. 2. February–March 1976. p. 8. Archived from the original on 2017-07-04. Retrieved 2022-07-01 – via HP Museum.

External links

• Hewlett-Packard Journal, November 1975 - includes technical details of the HP-22 Archived 2017-06-10 at the Wayback Machine
• Technical details

• HP calculators