HP-22S
| Company type | Product |
|---|---|
| Industry | Calculator manufacturing |
| Predecessor | HP-32S (counterpart) |
| Founded | 1988 |
| Headquarters | United States |
| Products | Scientific calculators |
| Parent | Hewlett-Packard |
The HP-22S is an algebraic scientific calculator developed by Hewlett-Packard, serving as a counterpart to the HP-32S. Rather than offering programming capabilities, it includes a solver function but retains the limited RAM capacity found in the 32S, which constrains more complex applications. Its primary features encompass TVM calculations and unit conversions, with variable names restricted to single letters. Designed primarily for students, it employs infix notation instead of HP’s traditional reverse polish notation.
Features
The HP-22S provides a range of typical scientific calculator functionalities, including:
- Hyperbolic and trigonometric operations
- Conversion between polar and rectangular coordinate systems
- Statistical and probability computations such as mean, standard deviation, weighted mean, and linear regression
- Base and unit conversion tools
Hardware
The 22S shares the 37-key layout and physical design characteristic of the Pioneer series and was introduced alongside the HP-32S. Both models utilize identical hardware platforms featuring a single-line dot matrix display capable of showing both numeric and alphabetic characters. It is powered by an HP Saturn Sacajawea processor running at 640 kHz, which results in slower performance compared to the more advanced HP-27S.
Equation solving and equation library
A notable aspect of the HP-22S is its equation solver combined with an integrated formula library, allowing users to enter equations involving multiple variables and solve for unknowns when provided with specific data.
The built-in formulas include widely used scientific and financial computations such as:
- Solutions to quadratic equations
- Calculations of kinetic energy
- Ideal gas law
- Fluid pressure determination
- Radioactive decay
- Time value of money