the fx-2500 was one of the early lcd, wallet style
unlike later models, the fx-2500 had a much reduced function set and
function limitations. for example, it does not have any operator precedence
and only 3 levels of brackets. other omissions include hours to HMS,
but it can convert the other way. presumably they had not invented the
casio way of displaying HMS at this stage.
was this newer or older than the fx-2000. the
2000 model number suggests it came first, but in some respects this model
has older functionality. compared to the fx-2000, we miss out on
hyperbolics, fractions and sexagesimal display. but to our advantage, we
the position of the on/off switch is also somewhat non-standard.
it is powered by 2 g13 batteries.