The Museum of HP Calculators

HP Forum Archive 13

[ Return to Index | Top of Index ]

Back on line & new articles !
Message #1 Posted by Valentin Albillo on 19 Aug 2003, 6:44 a.m.

Hiya all, just came back from my 26-day summer vacation out there in some beautiful & sunny Spanish beach.

Upon checking my regular mailbox, I was delighted to find there the latest issue of HPCC's "Datafile" publication (V22N4 July/August), which coincidentally happens to include [shameless plug] two of my articles, namely

HP-15C Nth degree Polynomial Fitting

A 6-page article which includes a program to fit a polynomial of up to 6th degree to a set of arbitrary data points. The program prompts for the data points, then computes and outputs the coefficients of the explicit polynomial which fits them all, in just 42 steps.

Long Live the Advantage ROM!

An 8-page article belonging to my commemorative "Long Live!" series, which includes a 41C/Advantage user-friendly, fully-prompting implementation of the above HP-15C program, in just 60 individually-commented steps, and including a thorough discussion of the differences between both approaches.

Four application examples are given in all, including fitting, interpolation, inverse interpolation, finding a polynomial given its roots, and exposing polynomials disguised as trigonometrics :-)

Of course, this Datafile issue is also choke-full of other interesting articles and programs, including:

"A Note in Internet Access with the HP-200LX"
"RPN, ALG, and the HP12C Platinum"
"HP-38G Clear Advantage Over HP48G/49G"
"Old Timers" [very interesting article on the HP-45/55 timer, by Jordi Hidalgo, includes extremely comprehensive references]
"QPI for HP42S"
"What is HP-42X?"
"EMU41 for HP48/49: Some hidden key-combinations"
"A substitue i-solver for the HP12C Platinum"
"HP Calculator History: the HP95LX"
etc, etc.

For the very next issues, expect to find (Mr. Bruce Horrocks permitting) several more of my articles, including "Long Live the HP-16C!", featuring a program which *really* makes the HP-16C capabilities shine, and an awesome, chess-related program for the HP-71B ! (ditto).

If you feel like having a look at some or all of these, I would heartily suggest you visit the HPCC's web site at:


Since the good old PPC, CHHU and HPX bit the dust, this is one of the best and most successful struggles to keep our beloved machines alive. You still get the old thrill of waiting for your issue to materialize in the mailbox, and read it with utmost delight and interest. So, anything we can do to help it going, be it submitting articles and programs, or subscribing, or both, will be in everybody's best interest.

Best regards from Valentin Albillo (formerly PPC member #4747, currently HPCC member #1075), who, needless to say, gets no profit at all from this, other than the pleasure of contributing to the HP calcs users' community.

Re: Back on line & new articles !
Message #2 Posted by Tom Scott on 19 Aug 2003, 8:27 p.m.,
in response to message #1 by Valentin Albillo

Thanks for the information on HPCC. Your contributions alone would probably make it worth joining.

Tom Scott Lander, Wy

Re: Back on line & new articles !
Message #3 Posted by Juergen Rodenkirchen (GER) on 20 Aug 2003, 3:05 a.m.,
in response to message #1 by Valentin Albillo

Read and enjoyed your articles a lot (even though alas I do not own a 15C). Keep on contributing those excellent articles to Datafile! Good to having you joining HPCC!

Best Wishes and Happy Hacking,

Juergen HPCC #1065

Thanks to both of you, and ...
Message #4 Posted by Valentin Albillo on 20 Aug 2003, 6:16 a.m.,
in response to message #1 by Valentin Albillo

... and, as usual, rest assured that I intend to make available these articles on line, in PDF format, in a near future, so that anyone interested can get them. I'll post a message here to let you know.

Meanwhile, as it can probably take some time, the fastest way of getting to read them is to subscribe to Datafile, which has the obvious extra-large benefit of being able to read all the other great articles featured, written by many very knowledgeable, kind contributors and which, naturally, I can't ever provide in any format for obvious legal reasons.

Best regards from V.

Welcome back!
Message #5 Posted by Vieira, Luiz C. (Brazil) on 20 Aug 2003, 7:48 a.m.,
in response to message #1 by Valentin Albillo

Hey, Valentin;

nice reading your words here again. I hope you had a good time in your vacations.

Unfortunately I'm running through some time-consuming activities for these days, but I am sure I'll have good moments when reading your papers.

Best regards from Brazil.


[ Return to Index | Top of Index ]

Go back to the main exhibit hall