casio fx-2500

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 have brackets.

the position of the on/off switch is also somewhat non-standard.