CASIO fx5500 Scientific Calculator: The 1st "C.A.S." pocket calculator?

02222017, 11:33 PM
(This post was last modified: 02222017 11:55 PM by jebem.)
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CASIO fx5500 Scientific Calculator: The 1st "C.A.S." pocket calculator?
"Factoring made easy" by Casio in 1986!
Was this CASIO fx5500 the first calculator in the market able to do symbolic calculus (formula manipulation) although in a very limited format, otherwise known as C.A.S. these days? This machine belongs to another local collector that kindly allowed me to have for some time for testing. This is a handy little machine, almost of the same size and form as the HP Voyager series, although featuring totally different capabilities and operation philosophy. Main features, based on the user manual:
Forensics test: arcsin (arccos (arctan (tan (cos (sin (9) ) ) ) ) ) Result: 9.000007164 the same as for the Casio fx730P among others. Doing (9Ans) *1000000 to find additional internal digits gives just 7.164. Using some expressions from the user manual examples to test the symbolic manipulation capability. Well, it is not a powerful manipulation and we can't even consider it a full C.A.S. system, but in 1986 it was something rare, if not unique, to see on a pocket calculator. Simplify 5X^2 + 7X  6  3X^2 + 2X + 9 Took about 2 seconds to find this result: 2X^2 +9X + 3 Just for fun, tried to Expand (X + 3)^5 It took about 8 seconds to find this result: X^5 + 15X^4 + 90X^3 + 270X^2 + 405X + 243 Jose Mesquita RadioMuseum.org member 

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