this is a rather good machine. one of the few 12+2 machines
made before formula entry became dominant. it has an extra 2 internal
digits making it operate internally to 14 digits of precision, more than
any other casio here. accuracy is good and it can handle a wide domain of
input (trigs over 1440, tanh of 1e10 etc). fractions are deluxe as well
with 10 net digits.
a good set of functions; fractions, hyperbolics, 2d stats with linear
regression, hex and octal bases, 6 `k' memories and interestingly a rom
catalog of 128 physical constants. these are recalled using the const
prefixed by an index 1 through 128. to remember what that constants are,
their indices and units, there is a reference card that lives in the
accompanying wallet for the machine. other nice touches are twin power
(solar and GR927 battery), keys for eng display, delete and x^2. all keys
are rubber and positive to operate.
its not programmable, however, and this would have have made it
complete together with built in numerical integration like the fx-3900pv.
there is a very similar, but programmable model to this, its the fx-50f.