For my A levels, in the first year I bought a graphic calculator. The college I was attending was getting a bulk order and I bought through that, I seem to remember it was about £30 but I might be wrong. So this is where graphic calculators began, it was a pretty neat machine, with a simple programming language too. Any exam would first involve writing a quadratic solver for use in problems! Programmables were allowed in the exam, as long as they had been "reset" before the exam started. I remember my A-level this procedure was done, but they did not press the reset button properly.
Found at:
http://www.voidware.com/calcs/fx7000g.htm
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