I was bored and found a HP-27S

[Don Shepherd]

(06-26-2014 01:23 PM)rprosperi Wrote:  

(06-25-2014 06:49 PM)jebem Wrote:  I'm back home (Lisbon district) from my travel from Africa, and had a package waiting for me at the Post Office.

Today I got my new acquisition: a HP-27S in a better condition than I was initially expecting.
Actually the photos enhance all the small imperfections and dust.
Made in Singapure, s/n:3122S04492 (Year 1991, week 22).

Nice machine Jebem, I think you will enjoy it, despite it's Algebraic nature.

Pull up a copy of HP-27S/19B Technical Applications (and of course the 27S UG) from the Museum DVD and learn the Solver.

Then search the Forum (OLD & NEW) for great articles from Don Shepherd and then, when you think you have it mastered, search for an article w/title something like "Long Equation for HP17B Solver" from Gerson IIRC. Astounding stuff, implementing the Trig functions and much more.

Keep in mind the Solver is the same for the 19B/19BII, 27S, 17B and 17BII, so you have to widen your search to get all the interesting Solver articles.

Don't forget Thomas Klemm, a true genius. See his article on the eight queens problem for an example of some brilliant solver code.