HP-34C
| Company type | Product |
|---|---|
| Industry | Electronics, Calculators |
| Predecessor | HP 30 series |
| Founded | 1979 |
| Defunct | 1983 |
| Successor | HP-15C |
| Products | Scientific and programmable calculators |
The HP-34C calculator, part of the HP 30 series, is a sophisticated scientific and programmable calculator device featuring continuous memory. Manufactured from 1979 to 1983, it was initially priced at US$150 and later reduced to US$100.
Integration and Root-Finding Capabilities
One of the HP-34C’s standout business functionalities was its groundbreaking ability to perform both integration and root-finding, marking a first for handheld calculators. Users could enter mathematical expressions as programs, which allowed the device to find multiple roots through a process called "deflation"—dividing the polynomial by <math>(x-x_0)</math> after identifying each root to isolate subsequent ones. This method improved accuracy by storing and recalling roots from memory registers.
Programming Functionality
The device supported up to 210 programming steps by reallocating registers into program memory. It featured advanced programming tools such as indirect jumps, broadening its operational scope. An included "applications" manual showcased two interactive games—Moon Rocket Lander and Nimb—highlighting the calculator’s programmability and user appeal. Additionally, simpler games like blackjack could be programmed easily by utilizing existing registers.
Lineage
In 1982, the HP-34C was replaced by the HP-15C. Although the HP-41C appeared soon after, it targeted a different audience due to its significantly higher cost—approximately twice that of the HP-34C—and distinct feature set. The HP-41C was notable as HP’s first LCD-based, expandable calculator but did not include the root-finding, integration, or gamma-function features found in the HP-34C. This allowed HP to cater to diverse market segments with high-end scientific programmable calculators, selling both models simultaneously for several years.
Construction
The HP-34C was available in multiple versions, including models with plastic or metal keyboards. Early units produced between 1979 and 1983 utilized pressure-mounted circuitry, whereas later 1983 editions incorporated soldered components for improved durability.