A new HP-67 Simulator for the iPhone

[Dieter]

(05-11-2016 01:38 AM)rprosperi Wrote:  Perhaps the addendum note only applies to some limited range of s/n?
Mine is 1812A01611.

This page on hpmuseum.org says that the trig inaccuracies apply to "earlier HP-67 and HP-97s", and also the addendum refers to an early (December 1976) issue of the 67 manual. Your 67 and Willy's are more than a year apart. Since the latter is from January 1977 this matches the date of the manual the addendum is intended for, and indeed the bugs are present.

So it looks like calculators from 1976/77 seem to be affected by this bug while it has been fixed on later 67/97s like yours. Maybe someone has some more detailled information on this.

Dieter