S&SMC #9 HP41cx  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: S&SMC #9 HP41cx (/thread75222.html) 
S&SMC #9 HP41cx  Jonathan Watmough  06192005 Hi Valentin, I am a lurker as far as your challenges, but I have greatly enjoyed reading them. I recently bought a HP41cx, so I thought I'd have a 'go' at trying to get #9 running on a HP41. This is the first program I've written on a calculator since about 1986 when I owned a Casio FX4000p. I'll feel kinda stupid if this is wrong, especially since I 'cheated' and looked at your original solution briefly, but I can't seem to find the original posts about this challenge. Sadly my school calculus is very rusty, so I played with EMU48 and plotted a few polynomials before I had any idea at all what was going on. The program ran for about an hour and 20 minutes before getting the following answers : A=1 B=5 C=8 D=7 I skipped the part about finding an exact root ;) Any suggestions, optimisations, rewrites etc are very welcome.
Best Wishes I used the following registers and labels :
Registers: Re: S&SMC #9 HP41cx  Valentin Albillo  06202005 Hi, Jonathan:
Thanks for your interest in my challenges. I also don't Your solution surely has to do with a much ancient S&SMC, but don't know exactly which, so I can't comment on the solutions posted at the time though I suppose that your program finds it correctly, whatever it was it had to find :)
Thanks again for your interest, and keep posting your HP41CX solutions to past, present, and future challenges.
Best regards from V.
