(HP-67/97) a little fun with the fifteen puzzle

[Dieter]

(12-05-2016 10:07 PM)Gene Wrote:  The X NE 0 or X <> 0 conditional is f + or yellow shift +.

Ah, so this is supposed to be a *test*!
I read this as an X exchange R0 command!

(12-05-2016 10:07 PM)Gene Wrote:  The best approaches to supplying the missing conditionals are found in this PPC booklet: Better Programming on the HP-67/97

Thank you for the link. The technique itself (two or more consecutive tests) is well known, I once wrote about this in the old forum.

Dieter