PPC Journal V2N6 - TVM i% unknown on HP-65

[rprosperi]

(10-18-2015 01:36 PM)Dieter Wrote:  This is another detail where earlier and later calculators differ. The first business oriented device, the HP80, had its five TVM keys in the order n i PMT PV FV. So did the HP22, as well as this annuity program for the HP65. Later models however used n i PV PMT FV (which seems a bit more logical).

I've not seen this discussed before; you're right Dieter, it is annoying. Having learned finance Fns on the newer models (you know, those 40 years or less), I consistently mess-up when using the HP-80, HP-22 and (my recently acquired) HP-27.

Though HP did stick with their standards, this is a good example of changing a standard when a better (or more logical as you say) idea comes along.