A new HP-67 Simulator for the iPhone

[Gerson W. Barbosa]

(05-11-2016 01:38 AM)rprosperi Wrote:  

(05-10-2016 07:20 PM)Gerson W. Barbosa Wrote:  If Vintage mode is meant to be as faithful as possible, perhaps you would like to know that X is not saved in last X for arguments equal to 0 or -1 for SIN⁻¹, COS⁻¹ and TAN⁻¹, according to the manual addendum (I don't have a real HP-67 to check this out). A minor trigonometric bug is also mentioned, but this should should better be ignored for ever.

Does not appear to be true on a real 67:

0, [g][4] (=ASIN) => 0.00
[h][0] (=Last-X) => 0.00

-1, [g][4] (=ASIN) => -90.00
[h][0] (=Last-X) => -1.00

-1, [g][5] (=ACOS) => 180.00
[h][0] (=LAST-X) => -1.00

Perhaps the addendum note only applies to some limited range of s/n?

Mine is 1812A01611.

Thanks for taking the time to check. The addendum is dated December 1976. Yes, these might already have been fixed in later runs.