HP-34C

Significant to the HP-34C calculator is the capability for integration and root-finding (a first for any pocket calculator).{{cite web|url= http://www.hpmuseum.org/hp34.htm |title= HP‐34 | work = The Museum of HP Calculators |accessdate=2007-12-15}} Integration and root-finding works by having the user input a formula as a program. Multiple roots are found using the technique of first finding a root $x=x\_0$, then dividing the equation by $(x-x\_0)$, thus driving the solution of the equation away from the root at that point. This technique for multiple root-finding is referred to as "deflation".{{Citation | title = HP-34C Owner's Handbook and Programming Guide | publisher = Hewlett‐Packard}}. The user would usually programmatically recall the root value from a storage register to improve its precision.

The common method of converting registers to program memory allowed the calculator a maximum of 210 program steps.{{Citation | url = http://www.hpmuseum.org/features/34cf.htm | publisher = HP Museum | title = 34CF | contribution = Features}}. Programming features such as indirect jumps provides substantial capability to the calculator's programmer.

The HP-34C shipped with an "applications" manual that included two games (Moon Rocket Lander and Nimb). This made the calculator probably one of the first pocket game computers ever invented. The winner was announced via calculator spelling by turning the display upside down and the words BLISS or I'LOSE (55178 or 3507,1) were displayed. A game of blackjack was easily programmable by converting some of the registers to lines of program.

The calculator was superseded, in 1982, by the HP-15C.

Although it is argued the HP-41C (introduced late 1979 and only a matter of months after the HP-34C) was a replacement for the HP-34C, they were in fact differentiated as much by price (the HP-34C being 50% that of the HP-41C) as by functionality and performance (the HP-41C being the first HP LCD-based and module-expandable calculator, with its standard functionality lacking the root-finding and integration capabilities as well as the gamma-function implementation of the HP-34C though). This price difference allowed those with economic constraints to still buy a high-end HP (HP-34C) scientific programmable within a reasonable cost. As such they were sold side-by-side for a number of years.

The HP-34C came in a number of variants, such as plastic- and metal-keyboard versions and those with soldered[http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv021.cgi?read=216753 HP 34C display problem] (later 1983 variants) vs pressure-mounted circuitry[http://www.hpmuseum.org/tech30.htm 30 Series Technology And Packaging] (earlier variants 1979–1983).

• List of Hewlett-Packard products: Pocket calculators
• HP calculators

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• {{cite web|url=http://www.rskey.org/detail.asp?manufacturer=Hewlett-Packard&model=HP-34C|title=Programmable Calculators - Hewlett-Packard HP-34C|publisher=rskey.org|accessdate=2013-07-14}}
• {{cite web|url=http://www.hpmuseum.org/hp34.htm|title=HP-34C|publisher=Museum of HP Calculators|accessdate=2013-07-14}}

{{HP calculators}}

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34C