(HP-67/97) Planetary Ephemeris

[Dieter]

(09-13-2015 11:10 AM)Thomas Klemm Wrote:  From Programming Handheld Calculators by Paul Lutus.

Could you take a look at line 101? The code there is...

Code:

 97 1
 98 RCL (i)
 99 FRAC
100 STO 3
101 -
102 1
103 RCL 3
104 -
105 /

This calculates (1–R3)/(1–R3) which is always 1. ;-)
I think line 101 should read "+".

I also assume that "lbl A", "lbl B", "lbl C" and "lbl D" in the user instructions (table 3) are supposed to mean simply "A", "B", "C" and "D".
Typing a label instruction in run mode does not do anything. ;-)

Finally there are some "TF" commands. This was a HP65 instruction. On the HP67/97 testing flags is done with the "F?" command. I hope the program considers the 67/97's special behaviour of Flag 2 tests. ;-)

Dieter