|Re: Credit Card Size RPN calculator?|
Message #7 Posted by Mike Morrow on 9 Mar 2009, 12:12 a.m.,
in response to message #5 by Dave
The Radio Shack version of the Casio lacked, IIRC, combination and permutation functions. I have the Casio model that you show. These were sold new in 1985. I bought several to give as gifts.
There was an earlier credit card Casio scientific available in late 1978! It is the fx-48. It doesn't have quite as many functions, and it isn't solar powered. It is very slightly smaller. I bought the one I have in January 1979.
In 1983, Casio sold a scientific wrist watch calculator, the CFX-200. It was quite useful, and it isn't much larger than other digital watches. I've still got one, but the calender and DOW function does not work properly after 12-31-1999. Later, a more elegant model in the form of the CFX-400 came out.
So the era of popular, consumer-grade, readily available scientific credit card or smaller calculators arrived more than 30 years ago and vanished more than 20 years ago. I suppose the market didn't support them.
Edited: 9 Mar 2009, 12:59 a.m.