Editing Calculator (section)

===Mid-1980s to present===
[[File:Elektronika MK-52.JPG|thumb|The [[Elektronika MK-52]] was a programmable RPN-style calculator that accepted extension modules; it was manufactured in the [[Soviet Union]] from 1985 to 1992]]
The first calculator capable of symbolic computing was the [[HP-28C]], released in 1987. It could, for example, solve quadratic equations symbolically. The first [[graphing calculator]] was the [[Casio fx-7000G]] released in 1985.

The two leading manufacturers, HP and TI, released increasingly feature-laden calculators during the 1980s and 1990s. At the turn of the millennium, the line between a graphing calculator and a [[handheld computer]] was not always clear, as some very advanced calculators such as the [[TI-89]], the [[TI-92 series|Voyage 200]] and [[HP-49G]] could [[derivative|differentiate]] and [[integral|integrate]] [[function (mathematics)|function]]s, solve [[differential equation]]s, run [[word processing]] and [[Personal information manager|PIM]] software, and connect by wire or [[infrared|IR]] to other calculators/computers.

The [[HP 12c]] financial calculator is still produced. It was introduced in 1981 and is still being made with few changes. The HP 12c featured the [[reverse Polish notation]] mode of data entry. In 2003 several new models were released, including an improved version of the HP 12c, the "HP 12c platinum edition" which added more memory, more built-in functions, and the addition of the algebraic mode of data entry.

[[Calculated Industries]] competed with the HP 12c in the mortgage and real estate markets by differentiating the key labeling; changing the "I", "PV", "FV" to easier labeling terms such as "Int", "Term", "Pmt", and not using the [[reverse Polish notation]]. However, CI's more successful calculators involved a line of construction calculators, which evolved and expanded in the 1990s to present. According to Mark Bollman,<ref>{{cite web |author=Mark Bollman |title=Mark->'s Calculator Collection |url=http://mathcs.albion.edu/~mbollman/Calculators.html |website=Mathcs.albion.edu |access-date=2011-07-19 |archive-url=https://web.archive.org/web/20110719135244/http://mathcs.albion.edu/~mbollman/Calculators.html |archive-date=2011-07-19 |url-status=live}}</ref> a mathematics and calculator historian and associate professor of mathematics at Albion College, the "Construction Master is the first in a long and profitable line of CI construction calculators" which carried them through the 1980s, 1990s, and to the present.