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

[Don Shepherd]

Thanks Dieter and Gene. I changed the x<y to x<=y in the code above.

Yes, I remember as I was entering the program that there was no x<y, so as Gene suggested I tried x<=y and that worked (it works because, in this instance, the two values in x and y can never be equal). I created the HP-67 program from a solver equation I had on the 17b which runs much faster than the 67 code (20 seconds versus 2 and a half minutes).

Thanks for that link Gene, it appears to be a treasure trove of good information on the 67. I plan on studying that document over the holidays.