HP-22
| Company type | Product |
|---|---|
| Industry | Electronics, Calculators |
| Predecessor | HP-70 |
| Founded | 1975 |
| Defunct | 1978 |
| Headquarters | Palo Alto , United States |
| Products | Financial calculator |
| Owner | Hewlett-Packard |
The HP-22 was a compact calculator designed specifically for financial applications, manufactured by Hewlett-Packard between 1975 and 1978. It succeeded the brief-lived HP-70 and was introduced alongside the HP-21 and HP-25, each model catering to distinct user segments.
Consistent with most HP calculators, the HP-22 utilized RPN featuring a four-level stack and provided ten memory registers accessible to users; however, stored data was erased when the device powered off. Its primary capabilities encompassed (1) time value of money (TVM) operations, permitting entry of any three variables to solve for the fourth, and (2) statistical functions including linear regression. The calculator also supported fundamental logarithmic and exponential calculations. A physical slider switch labeled "begin" and "end" allowed users to define payment timing parameters within TVM computations. The unit was equipped with a 12-digit LED readout and included a shift key to access secondary functions marked above the keys.
Developed under the codename Turnip, the HP-22 was part of Hewlett-Packard's Woodstock series. Its initial US price of $165 in 1975 decreased to $125 by 1978.
Additionally, an altered variant featuring a rear-facing display was produced by Educational Calculator Devices under the name EduCALC 22 GD.