 The HP-33C | |
| Type | Programmablescientific |
|---|---|
| Manufacturer | Hewlett-Packard |
| Introduced | 1978 |
| Discontinued | 1983 |
| Calculator | |
| Entry mode | RPN |
| Precision | 10 display digits exponent ±99 |
| Display type | LED |
| Display size | 1 line |
| CPU | |
| Processor | Saturn[1] (Lewis) |
| Programming | |
| Programming language(s) | RPN key stroke(fully merged) |
| Firmware memory | ?KB ofROM |
| Interfaces | |
| Ports | no |
| Other | |
| Power supply | 2×1.5V AA cell batteries or power supply |
| Weight | 6 oz (170 g) to 8 oz (230 g) |
| Dimensions | 141×75×29mm |
TheHP-30 orSpice series areRPN scientific hand-held calculators introduced byHewlett-Packard in 1978. Some models are programmable.
Perhaps the HP-30 series, Spice, was to be released as a replacement for the aging HP-20 series.[2][3] It has no expandability. The display provided better readability by increasing the digit size and adding commas.
The entry-level models were the HP-31E and 32E, which were not programmable, but even the 31E provided a self-check function.[4]
The HP-37E and 38E/C were the financial models of the Spice series.
The battery of these calculators can be changed without using tools. The housing is closed by screws.[5]
The HP-33E/C (49 steps plus subroutines),[6] HP-34C (70 steps)[7] and 38E/C (99 steps)[3] are programmable. The C-suffixed models have acontinuous memory.
The production of the 31E ended in 1980,[8] production of the other Spice models ended in 1983.[7] This calculator is well regarded in terms of quality, key stroke feel and daily usability for engineers.