HP-31E
| Company type | Product line |
|---|---|
| Industry | Calculator manufacturing |
| Founded | 1978 |
| Founder | Hewlett-Packard |
| Products | RPN scientific calculators (HP-31E, HP-32E, HP-33E/C, HP-34C, HP-37E, HP-38E/C) |
| Parent | Hewlett-Packard |
The HP-30 series, also referred to as the Spice series, comprises RPN scientific calculators introduced by Hewlett-Packard in 1978. Certain models within this lineup offer programmability.
Overview
Designed likely as successors to the earlier HP-20 series, the HP-30 Spice calculators do not support expansion but provide enhanced readability through larger digit displays and the inclusion of commas.
The entry-level options consisted of the non-programmable HP-31E and HP-32E models; notably, the HP-31E incorporated a self-test capability.
Within the Spice range, the HP-37E and HP-38E/C were tailored specifically for financial applications.
These devices feature user-replaceable batteries that can be accessed without tools, and their cases are fastened with screws for secure assembly.
Programming
Programmable units in this series include the HP-33E/C, which supports 49 programming steps plus subroutines; the HP-34C with 70 steps; and the HP-38E/C allowing up to 99 steps. Models designated with a "C" come equipped with non-volatile memory.
Production of the HP-31E ceased by 1980, while other Spice models were phased out by 1983. These calculators are well-regarded for their build quality, tactile keyboard response, and user-friendliness, especially among engineering professionals.
Simulators and emulators
- HP Calculator emulators compatible with Linux systems
Features
- Extensive scientific calculation capabilities
- Statistical functions available on HP-32E, HP-37E, and HP-38E/C
- Numerical integration provided by the HP-34C
- Programmability via keystroke sequences incorporating branching, loops, conditional tests, and flag operations