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Talk:Calculator input methods

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This is an old revision of this page, as edited by Krischik (talk | contribs) at 07:22, 1 July 2009 (no we can't help you). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Evolution

I think the article is should reflect historical evolution of calculator input methods. I identified the following phases:

1968 RPN
The first "calculator" to use RPN was the HP9100A, which was introduced in 1968, although this machine is now regarded by many as the first desktop computer. [1]
1970 Immediate execution with out operator precedence
In April 1970, the Pocketronic appeared on the Japanese market; it was a four-function, entirely electronic calculator that retailed for about $400.[2]
1974 Immediate execution with operator precedence
The SR-50 A TI SR-50 (1974) [...] of the first calculators to implement "algebraic logic" (i.e. operator precedence) where 1 + 2 x 3 gives you 7, not 9[3]
1982 Infix (BASIC)
The oldes I could find is the FX-700P from CASIO [4] - but I expect an Sharp around the same time.
1992 Infix (DAL)
Introduced in 1992 and an industry-first, SHARP's D.A.L. allows symbols and numbers of an equation to be entered as they are written. [5].

One problem for an encyclopaedic article is that not all phases have an official name.

  1. ^ http://www.calculator.org/RPN.html
  2. ^ http://www.datamath.org/Story/Datamath.htm#Texas%20Instruments
  3. ^ http://www.phys.uwosh.edu/mike/calcs.html
  4. ^ http://www.rskey.org/detail.asp?manufacturer=Casio&model=FX-700P
  5. ^ Direct algebraic logic
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