HP-28 series

HP-28 series

The HP-28C and HP-28S were two graphing calculators produced by Hewlett-Packard from 1987 to 1992. The HP-28 was the first calculator capable of solving equations symbolically.They were replaced by the HP-48 series of calculators, which grew from the menu-driven RPL programming language interface first introduced in the HP-28 series.

The HP-28 calculators shared a flip-open (book style) case. On the left side of the flip, there is an alphabetic keyboard (in alphabetic order). On the right was a typical scientific keyboard layout. The display was a 137x32 LCD matrix, usually displaying four lines of information (3 stack/command lines, plus one softkey label line).

Two models were produced, the HP-28C came first in 1987 with two kilobytes of usable RAM. A year later, the more common HP-28S was released with 32k of RAM and a directory system for filing variables, functions, and programs. The HP-28C used a single Saturn processor at 640 kHz whereas the HP-28S used a custom chip containing an improved Saturn processor core at 1 MHz (the HP-48S, the replacement for the 28, used the HP-28S CPU core at 2 MHz).

Among the drawbacks of the HP-28 was the lack of a computer interface. This meant that stored information could only be entered through the keypad and not backed up.

One of the interesting side notes for this calculator was its ability to store vast amounts of information including formulas thereby enabling students to "cheat" on tests.

ee also

* Graphing Calculator
* HP calculators
* HP-48 -- successor of the HP-28 series

External links

* [http://www.hpmuseum.org/hp28c.htm HP-28 at the HP Calculator Museum]
* [http://www.xahlee.org/prog/hp28s/hp28s.html A musical chords playing program]
* [http://mycalcdb.free.fr/main.php?l=0&id=835 HP-28S] pictures on [http://mycalcdb.free.fr MyCalcDB] (database about 70's and 80's pocket calculators)
* [http://h10025.www1.hp.com/ewfrf/wc/document?docname=bpia5189&cc=us&product=61858&dlc=en&lc=en&jumpid=reg_R1002_USEN HP Calculators - Replacement Batteries]
* Paul Courbis and Sébastien Lalande (1988), French book about ML programming, hardware upgrade and more cite web | title="Voyage au centre de la HP28c/s" | work=(with HP28 applications) | url=http://www.courbis.fr/spip.php?article17 (PDF files).
* [http://www.thimet.de/CalcCollection/Calculators/HP-28SC/Contents.htm HP-28 from Tony's Taschenrechner-Sammlung Calculator-Collection]


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • SÉRIES TRIGONOMÉTRIQUES — Les séries trigonométriques se sont introduites au XVIIIe et au début du XIXe siècle, en liaison avec certains problèmes de physique (mouvement des cordes vibrantes, propagation de la chaleur). Elles sont d’un usage courant en astronomie, en… …   Encyclopédie Universelle

  • SÉRIES ET PRODUITS INFINIS — La notion de limite d’une suite est à la base de l’analyse. Le langage des séries, équivalent à celui des suites, s’est imposé dès le XVIIe siècle à propos du développement des fonctions en série entière. Cependant, les fondements rigoureux de la …   Encyclopédie Universelle

  • Series 40 — based Nokia 6300 Series 40 is a software platform and application user interface (UI) software on Nokia s broad range of mid tier feature phones, as well as on the Vertu line of luxury phones. It is the world s most widely used mobile phone… …   Wikipedia

  • Séries de divisions de la Ligue nationale — de baseball Les cérémonies d avant match de la troisième partie d une des Séries de divisions 2008 à Los Angeles, entre les Dodgers et les Cubs. Les Séries de divisions de la Ligue nationale de baseball sont disputées annuellement en octobre dans …   Wikipédia en Français

  • Séries de divisions de la Ligue américaine — de baseball Vladimir Guerrero, des Angels, au bâton contre les Red Sox pendant les Séries de divisions 2008 au Fenway Park de Boston. Les Séries de divisions de la Ligue na …   Wikipédia en Français

  • Series of 1928 (United States Currency) — Series 1928 was the first issue of small size currency printed and released by the U.S. government. These notes were the first standardized notes in terms of design and characteristics, featuring similar portraits and other facets. These notes… …   Wikipedia

  • Series — may refer to:Mathematics and science* Series (botany), a taxonomic rank between genus and species * Series (mathematics), the sum of a sequence of terms * Series circuits, a kind of electrical network * Seriation (archaeology), a method of dating …   Wikipedia

  • Series+ — Séries+ Création 31 janvier 2000 Propriétaire Astral Media (50 %) Canwest Media (50 %) Slogan « La télé des émotions » Langue Français Pays d origine …   Wikipédia en Français

  • SÉRIES+ — Création 31 janvier 2000 Propriétaire Astral Media (50 %) Canwest Media (50 %) Slogan « La télé des émotions » Langue Français Pays d origine …   Wikipédia en Français

  • Séries + — Séries+ Création 31 janvier 2000 Propriétaire Astral Media (50 %) Canwest Media (50 %) Slogan « La télé des émotions » Langue Français Pays d origine …   Wikipédia en Français

  • Series Nacionales de Rugby a Siete — 2010 Fundación 2010 Temporada Inaugural 2010 No. de equipos 18 (Categoría mascu …   Wikipedia Español

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”