Editing Scientific calculator (section)

==History==
[[File:HP-35 Red Dot.jpg|left|thumb|120px|[[HP-35]], the world's first scientific pocket calculator, was introduced in 1972 by Hewlett-Packard. It used [[reverse Polish notation]] and an [[LED]] display.]]
[[File:Texas Instruments SR-50.jpg|right|thumb|120px|[[TI SR-50]]]]

The first scientific calculator that included all of the basic ideas above was the programmable Hewlett-Packard [[Hewlett-Packard 9100A|HP-9100A]],<ref>[http://www.hpmuseum.org/hp9100.htm HP-9100A/B at hpmuseum.org]</ref> released in 1968, though the [[Wang Laboratories|Wang]] LOCI-2 and the Mathatronics Mathatron<ref>{{cite journal|title=across the editor's desk: COMPUTING AND DATA PROCESSING NEWSLETTER - THE MATHATRON|journal=Computers and Automation|date=Mar 1964|volume=XIII|issue=3|page=43|url=http://bitsavers.org/magazines/Computers_And_Automation/196403.pdf|access-date=2020-09-05}}</ref> had some features later identified with scientific calculator designs. The HP-9100 series was built entirely from discrete [[transistor]] logic with no [[integrated circuit]]s, and was one of the first uses of the [[CORDIC]] algorithm for trigonometric computation in a personal computing device, as well as the first calculator based on [[reverse Polish notation]] (RPN) entry. HP became closely identified with RPN calculators from then on, and even today some of their high-end calculators (particularly the long-lived [[HP-12C]] financial calculator and the [[HP-48]] series of [[Graphing calculator|graphing calculators]]) still offer RPN as their default input mode due to having garnered a very large following.

The [[HP-35]], introduced on February 1, 1972, was Hewlett-Packard's first [[pocket calculator]] and the world's first handheld scientific calculator.<ref>[https://web.archive.org/web/20100408001406/http://www.ieee.org/about/news/2009/14april_1.html HP-35 Scientific Calculator Awarded IEEE Milestone]</ref> Like some of HP's desktop calculators it used RPN. Introduced at US$395, the HP-35 was available from 1972 to 1975.

Texas Instruments (TI), after the production of several units with [[scientific notation]], introduced a handheld scientific calculator on January 15, 1974, in the form of the [[TI SR-50|SR-50]].<ref>[http://datamath.org/SCI/WEDGE/sr-50.htm SR-50 page at datamath.org]</ref> TI's long-running [[TI-30]] series being one of the most widely used scientific calculators in classrooms.

[[Casio]], [[Canon Inc.|Canon]], and [[Sharp Corporation|Sharp]], produced their   graphing  calculators, with Casio's FX series (beginning with the Casio FX-1 in 1972<ref>[http://www.oldcalculatormuseum.com/casiofx1.html Casio FX-1 Desktop Scientific Calculator<!-- Bot generated title -->]</ref>). Casio was the first company to produce a Graphing calculator ([[Casio fx-7000G]]).