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Valentin Albillo · (This post was last modified: 09-21-2022 01:53 PM by Valentin Albillo.)

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Hi, all:

I'll use this newly created thread periodically to briefly announce any new updates to my HP site whenever I upload them.

I say "briefly" because, unlike the 11 previous announcements, I will not describe each file but will simply list their names. If interested, you can get the full description for the files (and download the files themselves) by just visiting my site.

I'll begin by listing right now the contents of updates #12 through #15, which were left unannounced when I took a two-month vacation from posting in these forums. Let's see:

Note: I'll appreciate it very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks in advance.

05-02-2020: Update #12 (5 files):

HP Program VA420 - HP-41C Eigenvalues of Symmetric Matrices - Jacobi.pdf
SHARP Thread VA006 - 2005-11-30 - Sharp PC-1425 documentation.pdf
SHARP Thread VA007 - 2006-10-15 - SHARP PC1600.pdf
Misc Picture VA146 - CPU Disassembly - VF170716AS.jpg
Misc Picture VA149 - Cosmic Pacifiers - VF170720AF.jpg

05-03-2020: Update #13 (10 files):

HP Program VA417 - HP-41C Systems of Linear Equations - Gauss-Seidel.pdf
HP Program VA421 - HP-41C NxN Matrix Inversion.pdf
SHARP Thread VA008 - 2006-01-31 - Question on Sharp PC-1500A Module.pdf
SHARP Thread VA009 - 2007-10-16 - Indirect addressing on the Sharp PC-1201.pdf
SHARP Thread VA025 - 2012-05-14 - Sharp PC 1211 display change.pdf
SHARP Thread VA030 - 2012-12-02 - Sharp PC-1500 question (F2 disabled).pdf
Misc Picture VA181 - Copper Shield - VF170514AZ.jpg
Misc Picture VA191 - Brainy Mitochondrion - VF170709AT.jpg
Misc Picture VA280 - Stucco Painting - VF170430BG.jpg
Misc Picture VA284 - Space Wasps - VF170319AJ.jpg

01-04-2020: Update #14 (24 files):

HP Program VA416 - HP-41C Mate w King Bishop Knight Practice.pdf
HP Picture VA001 - HP Collection - DSCI1375.jpg
HP Picture VA003 - HP Collection - DSCI1376.jpg
HP Picture VA005 - HP Collection - DSCI1377.jpg
HP Picture VA007 - HP Collection - DSCI1378.jpg
HP Picture VA009 - HP Collection - DSCI1380.jpg
HP Brochure VA040 - The First Family.jpg
HP Brochure VA042 - The First Family.jpg
HP Brochure VA044 - The First Family.jpg
HP Brochure VA046 - The First Family.jpg
HP Brochure VA020 - The Logical Choice.jpg
HP Brochure VA022 - The Logical Choice.jpg
HP Brochure VA024 - The Logical Choice.jpg
HP Brochure VA030 - Finding Your Way.jpg
HP Brochure VA032 - Finding Your Way.jpg
HP Brochure VA010 - Pyramid.jpg
SHARP Program VA061 - PC-1211 Mate w King Bishop Knight Practice.pdf
SHARP Thread VA050 - 2018-05-30 - SHARP PC 1211.pdf
Misc Picture VA155 - Inexpugnable Fortress - VF170704BI.jpg
Misc Picture VA177 - Fractal Bugs in Fractal Amber - VF170926AE.jpg
Misc Picture VA205 - Tablecloths - VF171130AJ.jpg
Misc Picture VA209 - Atmospheric Reentry - VF171127BC.jpg
Misc Picture VA239 - Millennium Falcon - VF171014AG.jpg
Misc Picture VA251 - Ivory Spiral - VF170625DV.jpg

15-04-2020: Update #15 (21 files):

HP Article VA043 - HP-71B Advanced Uses of STRNGLEX.pdf
HP Challenge VA511 - 2020-03-14 - SRC 006 Pi Day 2020 Special P01.pdf
HP Brochure VA050 - HP31E-32E-33E.jpg
HP Brochure VA060 - HP37E-38E.jpg
HP Brochure VA070 - HP-41C.jpg
HP Thread VA007 - 2003-07-03 - General Voyager display question.pdf
HP Thread VA008 - 2003-07-04 - My First eBay burn.pdf
HP Thread VA009 - 2003-07-08 - Quiz Evaluating polynomials.pdf
HP Thread VA011 - 2003-07-09 - New HP Calculators.pdf
SHARP Picture VA001 - SHARP Collection - DSCI1382.jpg
SHARP Picture VA003 - SHARP Collection - DSCI1387.jpg
SHARP Picture VA005 - SHARP Collection - DSCI1384.jpg
SHARP Thread VA000b - 2003-09-02 - My good luck a 10C.pdf
Chess Book Review VA101 - How Computers Play Chess.pdf
Chess Book Review VA102 - Chess Skill in Man and Machine.pdf
Chess Book Review VA103 - The Chess Computer Handbook.pdf
Chess Book Review VA104 - The New Chess Computer Book.pdf
Misc Picture VA183 - Dissolving - VF171121AV.jpg
Misc Picture VA185 - Kernel Universes - VF180403AM.jpg
Misc Picture VA193 - Brainy Cell - VF171120BN.jpg
Misc Picture VA195 - Black Hole Galaxy - VF180121AA.jpg

V.

Edited to reflect new update #39 in the thread's Subject

Valentin Albillo · 05-01-2020, 05:13 PM

Hi, all: (btw, this happens to be my 500^th post in this new forum)

I've just uploaded Update #16 to my HP site, namely the following 25 files (which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

01-05-2020: Update #16   (24 files + 1 replaced file + 1 new Section):

       HP Challenge VA512 - 2020-04-01 - SRC 007 2020 April 1st Ramblings.pdf
       HP Picture VA293 - HP-29C - JLP1040323.jpg
       HP Picture VA294 - HP-29C - JLP1040322.jpg
       HP Picture VA653 - HP-65 - JLP1040326.jpg
       HP Picture VA703 - HP-70 - JLP1040339.jpg
       HP Thread VA013 - 2003-07-18 - 12c Platinum Perpetuity challenge.pdf
       HP Thread VA015 - 2003-08-25 - Eigenvalues on 42S.pdf
       HP Thread VA016 - 2003-08-31 - HP-11C Solutions Handbook Errata.pdf
       HP Brochure VA003 - It Tells the Time Too.jpg
       HP Brochure VA100 - HP-35.jpg
       HP Brochure VA110 - HP-65.jpg
       Other Brochure VA010 - Revolutionary TI-58 TI-59.jpg
       Other Brochure VA020 - Programmable TI-59.jpg
       Other Brochure VA030 - TI The New Generation.jpg
       Other Brochure VA050 - TI SR-52 SR-60.jpg
       Other Brochure VA100 - Sinclair Cambridge - Executive.jpg
       Other Brochure VA110 - ATAIO FN-85 Financial.jpg
       Misc Picture VA197 - Hatching - VF171030AH.jpg
       Misc Picture VA207 - Bow and Arrow - VF171118AE.jpg
       Misc Picture VA208 - Paramecia - VF171121AY.jpg
       Misc Picture VA213 - Fiery Plow - VF171207AT.jpg
       Misc Picture VA250 - 3D Coronavirus - VF171027AS.jpg
       Chess Book Review VA402 - Encyclopaedia of Chess Endings IV.pdf
       Chess Book Review VA403 - Test Your Endgame Ability.pdf
       +
       HP Picture VA351 - HP-35s - P1570368.jpg    (replaced file)

A new Section ("Other Brochure") has been created as well, where you'll find a set of brochures I've collected over the years featuring calculators and pocket computers from assorted brands (other than HP and SHARP), including Texas Instruments, etc.

V.

Valentin Albillo · 05-15-2020, 11:06 PM

Hi, all:

I've just uploaded Update #17 to my HP site, namely the following 21 files (which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

15-05-2020: Update #17   (21 files + 1 new Section):

       HP Picture VA342 - HP-34C - FP1070508.jpg    in HP Calculator Pictures (scroll down to picture VA342)

       Chess Tests VA001 - Main Page.pdf
       Chess Tests VA002 - Notes on Problem Solving.pdf
       Chess Tests VA003 - Basic Suite Positions 01-05.pdf
       Chess Tests VA004 - Basic Suite Positions 06-10.pdf
       Chess Tests VA005 - Basic Suite Positions 11-15.pdf
       Chess Tests VA006 - Basic Suite Positions 16-20.pdf
       Chess Tests VA007 - Basic Suite Positions 21-25.pdf
       Chess Tests VA008 - Basic Suite Positions 26-30.pdf
       Chess Tests VA009 - Basic Suite Positions 31-35.pdf
       Chess Tests VA010 - Basic Suite Positions 36-40.pdf
       Chess Tests VA011 - Bizarre Positions 71-75.pdf
       Chess Tests VA012 - The Never Concept 81-82.pdf
       Chess Tests VA013 - Unsolved Positions 91-92.pdf
       Chess Tests VA014 - Amazing Problems 01-12.pdf
       Chess Tests VA015 - Amazing Solutions 01-12.pdf
       Chess Tests VA016 - Chessboard Problems 01-04.pdf
       Chess Tests VA017 - Chessboard Solutions 01-04.pdf
       Chess Tests VA018 - MATER A Searching Program.pdf
       Chess Tests VA019 - MATER Source Code.pdf
       Chess Tests VA020 - Acknowledgements.pdf

A new Section "Chess Tests" has been created as well, this is an abridged part of its description:

"With the advent of the Internet and my access to it in 1995, I pondered the idea of creating my own web page dedicated to HP Calcs and another one dedicated to Computer Chess and both materialized ca. 1998 as twin sites which proved quite popular until the free server where they were located was spammed to death and went out of business.

After a 20-year hiatus I resurrected the HP Calcs one and I have now resurrected the Computer Chess site, "Chess Tests" as well, the latter not as web pages again but as a set of near-facsimile PDF documents which preserve most of the contents with the same aspect and formatting the original simple, hand-created HTML web pages had back in 1998.

Chess Tests did at the time attract considerable attention and many chess authors (including true celebrities such as Mr. Robert Hyatt, the creator of the world-class Cray Blitz and Crafty chess programs, and top chess programmers such as Heiner Marxen, author of CHEST) sent their valuable results and many interesting comments."

V.

Valentin Albillo · 06-03-2020, 11:02 PM

Hi, all:

I've just uploaded Update #18 to my HP site, namely the following 20 files (this makes 555 files in all which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2020-06-05:   Update #18   (20 files, including a new Article):

       HP Article VA040 - Boldly Going - Mandelbrot Set Area.pdf    in HP Calculator Articles (scroll down to HP Article VA040)

8-page, 4-figure article belonging to my "Boldly Going" series, which includes a 98-step RPN program I wrote in 2019 for the HP-42S and physical/virtual compatibles, addressing and succeeding at the difficult task of computing an accurate estimation of the Mandelbrot Set's area in very reasonable times.

First of all, the various approaches in the literature are introduced and commented, then state-of-the-art results are presented, and finally the techniques used here are discussed at length, including comprehensive references. Two sample runs are featured as well as a main, "ultimate" run which achieves excellent accuracy in quite a short running time.

       HP Picture VA327 - HP-32SII - FHP32SII1.jpg
       HP Picture VA552 - HP-55 - JLPHP551.jpg
       HP Picture VA656 - HP-65 - JLP1040338.jpg
       HP Picture VA670 - HP-67 - JLPHP673.jpg
       HP Picture VA702 - HP-70 - JLP1040340.jpg

       HP Thread VA018 - 2003-09-24 - Improvement on HP-45.pdf
       HP Thread VA020 - 2003-09-30 - Favorite Calculator.pdf
       HP Thread VA022 - 2003-10-02 - No RPN calcs anymore.pdf
       HP Thread VA024 - 2003-10-05 - Mach number RPN vs Algebraic.pdf
       HP Thread VA025 - 2003-10-06 - RPN vs AOS GOOD examples.pdf
       HP Thread VA026 - 2003-10-15 - HP-71 Math Pac Manual (Spanish).pdf

       SHARP Picture VA450 - SHARP PC-1450.jpg

       SHARP Brochure VA002 - Asimov on TRS-80 Pocket Computer.jpg
       Other Brochure VA045 - TI Technology.jpg

       Misc Picture VA010 - Sample - Fiery Maelstrom - VF171205AX.jpg
       Misc Picture VA018 - Sample - Snow Crystals - VF180215AC.jpg
       Misc Picture VA220 - Highway to Heaven - VF171214AA.jpg
       Misc Picture VA224 - Eating and Eaten - VF171027AM.jpg
       Misc Picture VA256 - Chained Tusks - VF170625DQ.jpg

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Valentin Albillo · (This post was last modified: 07-17-2020 12:35 AM by Valentin Albillo.)

Hi, all:

I've just uploaded Update #19 to my HP site, namely the following 7 files (this makes 562 files in all which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2020-07-07:   Update #19   (7 files, including *two* new Articles):

       HP Article VA044 - HP-71B Math Pac 2 Comments and Proposals.pdf    in HP Calculator Articles (scroll down to HP Article VA044)

25-page article, extensively detailing the new keywords and functionalities I propose for the HP-71 Math Pac 2, an undergoing new exciting project of Jean-François Garnier, the author of Emu71/DOS.

Now I’ve been very carefully considering what would be the most useful additions to the original Math Pac set which would still fit in the 5 Kb or so of unused ROM space available, while optimizing the usefulness and minimizing the implementation difficulty, and this article is the set of comments and proposals I came up with. It proposes and fully describes 22 new keywords, each graded for priority and difficulty, documented in HP-Manual-style fashion as if they were already existing keywords, including description, syntax, parameter types, comments, carefully-chosen full-fledged worked examples and a substantial rationale on its usefulness and why it was selected.

A future sequel article (VA045) will include my optimized BASIC-code implementations for all the functionalities described here (which I actually used to create the worked examples and their results), to be used as a reference for the eventual conversion to Saturn Assembler code (as new keywords and/or binary subprograms), as well as being of use by themselves in the meantime, by simply calling them from user programs.

HP Article VA040b - Boldly Going - Mandelbrot Set Area (71B).pdf in HP Calculator Articles (scroll down to HP Article VA040b)

8-page, 4-figure article belonging to my "Boldly Going" series, which includes a 9-line BASIC program I wrote in 2019 for the HP-71B and virtual compatibles, addressing and succeeding at the difficult task of computing an accurate estimation of the Mandelbrot Set's area in very reasonable times.

Note: This is the HP-71B version of my already uploaded article HP Article VA040a - Boldly Going - Mandelbrot Set Area Modify (42S).pdf. The Introduction and References/Notes are mostly the same but the actual code Listing, Usage Instructions and Sample/Ultimate runs are completely specific to this version..

and also ...

       Misc Picture VA002 - Sample - Multiverse - VF171205AW.jpg
       Misc Picture VA013 - Sample - Dodging the Black Hole - VF171206AG.jpg
       Misc Picture VA017 - Sample - Salvaging Titanic - VF171010AE.jpg
       Misc Picture VA020 - Sample - Greyscale Palette - VF180127AN.jpg
       Misc Picture VA253 - Infinity Pearls - VF170625DC.jpg

V.

Valentin Albillo · 07-17-2020, 12:37 AM

Edit 2020-07-17: I've uploaded an updated version of the file "HP Article VA044 - HP-71B Math Pac 2 Comments and Proposals.pdf" which corrects ~20 minor errors, mostly typos and formatting. If you did download this file you might want to download the updated one to replace it. To determine which version you have, check the file size:

Old version: 823.373 bytes
New version: 895.633 bytes.

Valentin Albillo · 09-05-2020, 05:54 PM

Hi, all:

After the summer vacations and as today it's Sep, 5th and I recently posted my 555th message to the forum, I've just made available Update #20 at my HP site, namely the following 8 files (this makes 570 files in all which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2020-09-05:   Update #20   (8 files, including one new Article):

       HP Article VA046 - Boldly Going - Abundant but Rare.pdf  (click to see or download)  in HP Calculator Articles

7-page article belonging to my “Boldly Going” series, this time dealing with a most fascinating topic in Number Theory, namely finding a particularly rare kind of so-called abundant numbers.

The qualifier “abundant” refers to a classification of the positive integers which considers them as being either deficient, perfect or abundant depending on the sum of their proper divisors, and we’re boldly going to find a most rare variety of the latter, so rare in fact that up to 10²¹⁰ there are only seven of them, A₁ to A₇, the last one being a 205-digit number no less.

Anyway, my trusty vintage HP-71B quickly finds and display all seven, exactly. This article also features a very useful 5-line user-defined function to compute the "Sum of Proper Divisors" number-theoretical function and two variants, including several interesting examples of use.

And last but not least, there's also (click on any of them to see or download):

3 Selected HP Threads:

      HP Thread VA034 - 2003-11-11 - Humor Eavesdropping at KinHPo.pdf
      HP Thread VA035 - 2003-11-11 - Your Favourite Calculator.pdf
      HP Thread VA036 - 2003-11-15 - What is your OWN favorite RPN program.pdf

4 Selected FractVal images:

      Misc Picture VA211 - Interference - VF171202AO.jpg
      Misc Picture VA212 - Distorting Spacetime - VF180118AE.jpg
      Misc Picture VA216 - Neutrino Trap - VF180327AA.jpg
      Misc Picture VA221 - Magnetic Dipole - VF180121AH.jpg

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Valentin Albillo · 10-07-2020, 08:54 PM

Hi, all:

I've just made available Update #21 at my HP site, namely the following 8 files (this makes 578 files in all which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2020-10-07:   Update #21   (8 files, including one new Article):

       HP Article VA047 - Boldly Going - Eigenvalues and Friends.pdf  (click to see or download)  in HP Calculator Articles

15-page article, featuring a subprogram, PCHAR, which deals with an advanced functionality very frequently needed in all sort of disciplines in Science, Engineering and Computing, yet not covered at all in the HP-71 Math Pac ROM, namely the task of computing all eigenvalues real and complex of an arbitrary real or complex square matrix.

Subprogram PCHAR is very short (6 lines, 271 bytes) yet capable of quickly and accurately computing the Characteristic Polynomial of an arbitrary NxN real or complex square matrix in a format ready for computing all its real and complex eigenvalues with a single call to MAT..PROOT or PZER, so you get the task done using just two statements: calling PCHAR and executing MAT..PROOT or PZER.

Additionally and as a big bonus, it also computes real/complex determinants and inverse matrices with accuracy far exceeding in some significant cases what the assembler-code MAT..INV, MAT..SYS and DET keywords can achieve (none of which can compute complex determinants, by the way), and at no extra cost whatsoever either in memory usage or computing time. For instance, it will exactly invert my "Mean Matrix" AM#7 without batting an eyelid.

Many relevant, fully worked-out and commented examples included, as well as a detailed discussion on how to convert PCHAR to a binary subprogram or LEX keyword.

And last but not least, there's also the following files (click on any of them to see or download):

3 Selected HP Threads:

      HP Thread VA031 - 2003-11-04 - 15c or 32s which is better.pdf
      HP Thread VA032 - 2003-11-07 - 49gplus first impressions.pdf
      HP Thread VA033 - 2003-11-10 - Re Therapy Please repeat after me.pdf

4 Selected FractVal images:

      Misc Picture VA218 - Gravitational Waves - VF171206AI.jpg
      Misc Picture VA229 - Seaweed - VF180215AG.jpg
      Misc Picture VA238 - Scaping - VF171123BH.jpg
      Misc Picture VA245 - Cushion - VF171109BD.jpg

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

V.

Valentin Albillo · 11-05-2020, 05:26 PM

Hi, all:

I've just made available Update #22 at my HP site, namely the following 8 files (this makes 586 files in all which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2020-11-05:   Update #22   (8 files, including one new Article):

       HP Article VA049 - Boldly Going - HP-16C Scientific Functions Part 2.pdf  (click to see or download)  in HP Calculator Articles

7-page article, featuring the second part of the mini-series of articles dedicated to provide the HP-16C Computer Scientist calculator with a comprehensive set including the main scientific functions usually available in most HP scientific models, and some of them even in financial models such as the HP-12C.

Here I address the implementation of the 7 inverse functions, namely arcsin(x), arccos(x), arctan(x), arcsinh(x), arccosh(x), arctanh(x) and ln(x), corresponding to the direct ones already discussed and implemented in Part 1.

All seven inverse functions fit into a single, relatively short (100-step or 99-step) program, work over full or very extended ranges (up to −10⁵⁰ < x < 10⁵⁰ or 10¹⁰⁰, depending on the particular function), execute fast over the whole argument range (a few seconds at most), and each function is called by pressing just two easy-to-remember keys. Many examples included covering the whole range for each function.

And last but not least, there's also the following files (click on any of them to see or download):

3 Selected HP Threads:

      HP Thread VA028 - 2003-10-22 - HP-41CX to PC connection.pdf
      HP Thread VA029 - 2003-10-26 - HP 32S vs HP32SII.pdf
      HP Thread VA030 - 2003-10-26 - Sorting on a 12C.pdf

4 Selected FractVal images:

      Misc Picture VA023 - Sample - Cellular Mitosis - VF171123BM.jpg
      Misc Picture VA214 - Azure D'Or - VF171129BN.jpg
      Misc Picture VA215 - Flying Through Lava - VF171205AS.jpg
      Misc Picture VA225 - Eddies - VF171203AF.jpg

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

V.

Valentin Albillo · 12-03-2020, 11:04 PM

Hi, all:

I've just made available Update #23 at my HP site, namely the following 6 files (this makes 592 files in all which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2020-12-03:   Update #23   (6 files, including one new Article):

       HP Article VA051 - Boldly Going - Climbing Project Euler.pdf  (click to see or download)  in HP Calculator Articles

12-page article, featuring Project Euler, a fantastic Internet project which attempts (and succeeds, in spades !) at providing a huge supply of challenging math + programming problems which are immensely fun to try and solve, while learning loads of new concepts and sharpening your own skills in the process.

In this article I tell my story with PE and how I dealt with it back in 2011 during the second half of my summer vacations, using the vintage 1984-era HP-71B (emulated & physical), which is many orders of magnitude slower and less capable than the hardware/software combinations PE's problems are primarily intended for (i.e.: fast modern CPUs + high-level compiled languages), thus enormously upping the ante when tackling them with ancient hardware and interpreted BASIC. See for yourself how I did !

The article features no less than 7 carefully-selected, non-trivial Project Euler problems wich are discussed and solved, with code and full comments, and which you might want to try and solve on your own with your preferred HP calc.

Last but not least, there's also the following files (click on any of them to see or download):

1 Selected HP Thread:

      HP Thread VA027 - 2003-10-15 - Reverse Engineering HP Solve.pdf

4 Selected FractVal images:

      Misc Picture VA228 - The Boss - VF171201AM.jpg
      Misc Picture VA231 - Information Highways - VF171123AX.jpg
      Misc Picture VA233 - Fractfish School - VF171205BB.jpg
      Misc Picture VA241 - Jellyfishes - VF180127AM.jpg
\begin{array}{|c|c|} \hline Notice \\\hline \end{array}

I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed.Thanks.

V.

Valentin Albillo · 12-17-2020, 05:27 PM

Hi, all:

I've just made available Update #24 at my HP site, namely the following 8 files (this makes 600 files in all which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2020-12-17:   Update #24   (8 files, including one new Article):

       HP Article VA042a - Boldly Going - Outsmarting PROOT (42S).pdf  (click to see or download)  in HP Calculator Articles

15-page article belonging to my "Boldly Going" series, which includes a small 131-step RPN subprogram PZER (plus an optional driver) for the HP-42S and compatibles (DM42, Free42, Emu42, etc.) dealing with a glaring limitation of the built-in function set of the HP-42S, namely the absence of some equivalent to the HP-71B Math ROM’s keyword PROOT, the polynomial root finder which finds at once all real/complex roots of an N^th-degree polynomial.

The HP-42S includes ample built-in functionality akin to the one provided by the HP-71B Math ROM (and the RPL models), such as complex numbers and operations, matrix operations, even Solver and Integrate tools, but it lacks any equivalent of PROOT (which by the way, works only for polynomials having real coefficients). On the other hand, PZER works efficiently and accurately for polynomials whose coefficients are real and/or complex, and can work globally (no inputs or initial guesses required whatsoever, just the coefficients) while also providing extra control to the user if desired. It can be called from your own programs or manually from the keyboard.

The article features tables detailing timings and relative speeds for the various compatible devices physical and virtual, plus 10 fully worked examples, including one comparing PZER's performance vs. PROOT when finding all 100 complex roots of a 100^th-degree polynomial (200 components in all) to 12-digit accuracy, which if using Free42 takes just 20" on an iPhone 8 and as little as 0.4" on a MacBook laptop. There's also examples solving polynomials having multiple roots (double, triple, ...), and finding all roots with up to 34 correct digits when using a physical DM42 or the virtual Free42 Decimal.

Last but not least, there's also the following files (click on any of them to see or download):

3 Selected HP Threads:

      HP Thread VA037 - 2004-02-23 - Scanning advice needed.pdf
      HP Thread VA038 - 2003-11-28 - Hyperbolics with the Advantage.pdf
      HP Thread VA039 - 2004-02-15 - RPL challenge area between 2 curves.pdf

4 Selected FractVal images:

      Misc Picture VA003 - Sample - Flaming Teapot - VF171126AJ.jpg
      Misc Picture VA006 - Sample - Frisbee in Flight - VF171202AU.jpg
      Misc Picture VA012 - Sample - Baroque Works.jpg
      Misc Picture VA014 - Sample - Will of D - VF171210AC.jpg

plus some pertinent Maintenance:

"Boldly Going - Outsmarting PROOT (42S)"

Description

HP-42S

"Boldly Going - Eigenvalues and Friends"

Description

HP-71B

"Boldly Going - HP-16C Scientific Functions Part 2"

Description

HP-16C

"Boldly Going - Climbing Project Euler"

Description

HP-71B

\begin{array}{|c|c|} \hline Notice \\\hline \end{array}

I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

That's all for now. I wish you all a Merry Christmas and a Happy New Year 2021 !
V.

Valentin Albillo · (This post was last modified: 01-26-2021 07:05 PM by Valentin Albillo.)

Hi, all:

I've just made available Update #25 at my HP site, namely the following 11 files (this makes 601 files in all which you can see and/or download for free), plus a lot of Maintenance-related changes:

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2021-01-26:   Update #25   (11 files, including one new Article):

       HP Article VA054 - My suggested New Features for Free42.pdf  (click to see or download)  in HP Calculator Articles

16-page article, these are my well-pondered and researched suggestions of functionalities which could be implemented in Thomas Okken’s awesome HP-42S simulator, Free42, to very significantly increase its capabilities with minimum effort. All of them are based on the functionalities that I’ve frequently found necessary to use in my own programs to either simplify the programming effort or to very significantly increase the speed but alas, they weren’t currently available at the moment I needed them. This might be the time to remedy these omissions for good, most especially as they are mostly really easy to implement !

The article includes all proposed functions and functionalities grouped in the following 7 categories: Math functions (including Basic functions, Advanced functions, Number Theoretic functions, Statistics functions), Matrix operations and functions, Polynomial-related functions, Constants, Loop-related functions and functionalities, Utility keywords and Additional useful functionalities. Each function is described and classified for both its usefulness and implementation difficulty, with examples and stack diagrams where appropriate and a rationale for why am I proposing it and why should it be desirable to implement it.

Last but not least, there's also the following files (click on any of them to see or download):

3 Selected HP Threads:

      HP Thread VA040 - 2004-05-24 - Douglas Adams and Hitchhikers Guide to the Galaxy.pdf
      HP Thread VA041 - 2004-06-10 - HP 33s - Dead or Alive.pdf
      HP Thread VA042 - 2004-06-14 - Programming astronomical data.pdf

3 Selected HP Computer Threads:

      HP Computer Thread VA005 - 2003-11-23 - HP-85B internal information.pdf
      HP Computer Thread VA010 - 2003-11-26 - Re HP-85B internal information.pdf
      HP Computer Thread VA015 - 2004-02-09 - HP85 Emulator Viper.pdf

4 Selected FractVal images:

      Misc Picture VA004 - Sample - Bullet Shockwave - VF171114BG.jpg
      Misc Picture VA016 - Sample - Winding Gateway- VF171121BA.jpg
      Misc Picture VA243 - Psychedelic Strips - VF170413DK.jpg
      Misc Picture VA246 - ST Voyager rams Bird of Prey - VF171015AN.jpg

Maintenance:

Category

"HP Computer Selected Threads"

HP Challenge VA022 - Short Sweet Math Challenge 21 Powers that be.pdf

HP Challenge VA024 - Short Sweet Math Challenge 22 April 1st 2018 Spring Special.pdf

HP Challenge VA026 - Short Sweet Math Challenge 23 May the 4th Be With You Special.pdf

*

HP Challenge VA029 - Short Sweet Math Challenge 24 2019 Spring Special 5-tier.pdf [i]

*

Jeff O.

SRC 001 - Spiky Integral

SRC 002 - Almost integers and other beasties

SRC 005 - April 1st Mean Minichallenge

SRC 006 - Pi Day 2020 Special { includes an additional post by EdS2 (#21) }

HP Challenge VA023 - Short Sweet Math Challenge 21 Powers that be P02.pdf

HP Challenge VA025 - Short Sweet Math Challenge 22 April 1st 2018 Spring Special P02.pdf

HP Challenge VA027 - Short Sweet Math Challenge 23 May the 4th Be With You Special P02.pdf

HP Challenge VA028 - Short Sweet Math Challenge 23 May the 4th Be With You Special P03.pdf

HP Challenge VA030 - Short Sweet Math Challenge 24 2019 Spring Special 5-tier P02.pdf

HP Challenge VA031 - Short Sweet Math Challenge 24 2019 Spring Special 5-tier P03.pdf

HP Challenge VA502 - 2018-07-11 - SRC 001 Spiky Integral P02.pdf

HP Challenge VA503 - 2018-07-11 - SRC 001 Spiky Integral P03.pdf

HP Challenge VA505 - 2018-12-14 - SRC 002 Almost integers and other beasties P02.pdf

HP Challenge VA510 - 2019-04-01 - SRC 005 April 1st Mean Minichallenge P02.pdf

Articles

Latest Additions

Main Page

dark red

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I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

V.

Valentin Albillo · 03-05-2021, 06:21 PM

Hi, all:

I've just made available Update #26 at my HP site, namely the following 8 files (this makes 609 files in all which you can see and/or download for free):

Note: I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2021-03-05:   Update #26   (8 files, including one new Article):

       HP Article VA042b - Boldly Going - Outsmarting PROOT (71B).pdf  (click to see or download)  in Section HP Calculator Articles

15-page article belonging to my "Boldly Going" series, this is the original version for the HP-71B of my article "HP Article VA042a - Boldly Going - Outsmarting PROOT (42S)".

Though this article appears at first sight quite similar to the version for the HP-42S published in Update #24, it was actually written earlier and includes additional sections discussing the internal workings of PROOT and their differences, as well as more examples specific to the 12-digit precision available in the HP-71B, which aren't featured in the HP-42S version. Also, it can be very useful for HP-42S users to better understand the RPN version innards, as the BASIC code is much clearer and the algorithm is exactly the same.

The article includes a small 11-line BASIC subprogram PZER (plus an optional driver) for the HP-71B and emulators (Emu71/DOS, Emu71/Win, go71b, etc.) dealing with a glaring limitation of the HP-71B Math ROM’s keyword PROOT, the polynomial root finder which finds at once all real/complex roots of an N^th-degree polynomial but only works for polynomials having real coefficients. On the other hand, PZER works efficiently and accurately for polynomials whose coefficients are real and/or complex, and can work globally (no user inputs or initial guesses required whatsoever, just the coefficients) while also providing the user with extra control if desired. It can be called from your own programs or manually from the command line.

The article features tables detailing timings and relative speeds for the various devices physical and virtual, plus 10 fully worked examples, including one comparing PZER's performance vs. PROOT when finding all 100 complex roots of a 100^th-degree polynomial (200 components in all) to 12-digit accuracy. There's also examples solving polynomials having multiple roots (double, triple, ...) and exploring how to use the options to enhance their accuracy.

Last but not least, there's also the following files (click on any of them to see or download):

3 Selected HP and SHARP Threads:

      HP Thread VA043 - 2004-06-15 - Geometric progression.pdf
      HP Thread VA044 - 2004-06-25 - A simple question on trading.pdf
      SHARP Thread VA004b - 2003-12-02 - How many calcs do you have.pdf

4 Selected FractVal images:

      Misc Picture VA009 - Sample - Cosmic Panspermia - VF171204AE.jpg
      Misc Picture VA217 - Pulsar Overload - VF171205AZ.jpg
      Misc Picture VA257 - Avocado Still Life - VF170626AA.jpg
      Misc Picture VA278 - Fractal Op-Art - VF161220AS.jpg
\begin{array}{|c|c|} \hline Notice \\\hline \end{array}

I'll appreciate it if very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

V.

Valentin Albillo · (This post was last modified: 05-02-2021 12:45 PM by Valentin Albillo.)

Hi, all:

I've just made available Update #27 at my HP site, namely the following 12 files (this makes 621 files in all which you can see and/or download for free):

Note: I'll appreciate it very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2021-05-01:   Update #27   (12 files, including one new Article):

       HP Article VA038 - DOMINOKU – Swiftly Solving Domino Grids.pdf  (click to see or download)  in HP Calculator Articles

10-page article, this time featuring a program I wrote years ago for the HP-71B to solve a newspaper-style domino puzzle which goes by assorted names (“Domino Logic”, “Domino Hunt”, “Domino Dilemma”, “Dominosa”, etc.) where you’re given all 56 numbers (pips) corresponding to the full set of 28 dominoes already placed on a grid in some order, and you must find the exact location for each domino. For example:

My program can solve grids of any shape, not just rectangular, up to 9x9, even with holes inside, and as was the case with my Sudoku solver, it is a nice example of how recursion can be extremely useful to simplify the programming by implementing a search procedure which calls itself to go deeper and deeper until the puzzle is completely solved or else determined to be inconsistent and thus have no solution. 8 fully worked examples included.

3 Selected HP Challenges

HP Challenge VA030 - Short Sweet Math Challenge 25 San Valentin Special - Weird Math.pdf

60-page thread (50 posts), a new "San Valentin's Special: Weird Math" S&SMC#25, featuring 6 Concoctions 6 dealing with weird, unexpected math results, including weird limits, weird infinite summations, weird integrals, weird graphs which are not what they seem to be, weird primes which are perfect in a very particular sense and to top it all, an alleged explanation on why some years are exceptionally catastrophic.

The various parts gathered much interest and a very lively discussion with plenty of code, graphics, solutions and comments being posted (including my original ones), as can be ascertained by the 60 pages in the thread. Don't miss it, it's great fun and an opportunity to acquire new exciting knowledge !

HP Challenge VA513 - 2021-01-02 - SRC 008 2021 is here.pdf

19-page thread (41 posts), in which I give a warm welcome to New Year 2021 by proposing three interesting little problems featuring 2021 for the readers to solve, including an amazing definite integral which will surprise everyone and their uncle, plus two nice, easier problems.

Lots of code, exact results, theoretical explanations and assorted comments were posted by a number of MoHPC forum members, including my own original ones. Pretty interesting reading at any rate plus you may try and solve them on your own as well.

HP Challenge VA514 - 2021-01-02 - SRC 008 2021 is here - Printable.pdf

Printable version of the above challenge, so that code in CODE panels will appear.

HP Challenge VA515 - 2021-03-14 - SRC 009 Pi Day 2021 Special.pdf

28-page thread (38 posts) commemorating Pi Day 2021, including 6 new assorted appearances of Pi and other trivia, such as two very aesthetically pleasing integral equations (one of them somehow connecting Pi with Lambert's W function), a seemingly unexpected finite expression giving Pi as a function of e, an unexpected result for the summation of the volume of certain hyperspheres, ramblings on Kate Bush and Pi, The Simpsons and Pi, links to some unbelievable (literally !) "peer reviewed" papers on Pi and even a bilingual small joke (very small).

Lots of code, theoretical explanations, results, and plenty of interesting comments, including my extensive original ones. A very good way to have fun while learning some interesting facts in the process.

Last but not least, there's also the following files (click on any of them to see or download):

3 Selected HP Threads:

      HP Thread VA002b - 2003-06-03 - 11c Voyager.pdf
      HP Thread VA002c - 2003-06-04 - I email HP about need a 41CX.pdf
      HP Thread VA002d - 2003-06-07 - HP-71B.pdf

4 Selected FractVal images:

      Misc Picture VA007 - Sample - Pastel Heart - VF171206AK.jpg
      Misc Picture VA219 - Beach Dune Road - VF171123BB.jpg
      Misc Picture VA237 - Troubled Waters - VF171209AM.jpg
      Misc Picture VA270 - Hot Ball Bearings - VF170626AT.jpg

plus some pertinent Maintenance:

HP Article VA042b - Boldly Going - Outsmarting PROOT (71B).pdf

HP Picture VA710 - HP-71B.jpg

\begin{array}{|c|c|} \hline Notice \\\hline \end{array}

I'll appreciate it very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

V.

Valentin Albillo · 09-16-2021, 10:27 PM

Hi, all:

Last Sept., 13th I've made available mega-Update #28 at my HP site, namely the following 25 files (this makes 646 files in all which you can see and/or download for free):

Note: I'll appreciate it very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

2021-09-13:   Update #28   (25 files, including two new Sections; ~ 400 pages, ~ 230 MB in all):

      This one is the first of a series of updates fully dedicated to my new Project HAM, a project to make available online all my 40+ year-old vintage materials from 1976 to 1985, which amounts to over 2,000 pages in all, most from the period 1979-1981. You can read all about Project HAM in this PDF document:

            Introducing Project HAM (Historic Albillo Materials)

      I've scanned all those materials at 300 dpi, resulting in 2,552 x 3,508 PNG images, either greyscale or 24-bit color, which have been kindly and expertly postprocessed by Eric Rechlin himself, and collected into multi-page PDF documents, which also include OCR'd text whenever possible. Some of them additionally contain a text file with my very own Notes detailing the document's background, history and interesting trivia.

      The two new Sections created to better support Project HAM are the following:

      HP Calculator Raw Scans

            This Section features scans I've made of assorted documents other than Pictures or Brochures, such as booklets or bulletins. Most are scans of 40+ year-old vintage documents not authored by me but which were sent to me back then, and due to their perceived rarity (even uniqueness right now) I'm making them available here.

      HP Calculator Selected Letters (ca. 1981)

            This Section features scans I've made of selected letters I exchanged with a number of HP-calc fans or HP-related people, mainly from 1979 to 1981 and a few beyond that period. Due to their possible historic worthiness I'm making them available here for the very first time.

      Project HAM Materials not belonging to those two Sections will be featured in their respective already-existing Sections, e.g.: Brochures, Calculator Programs, Computer Programs, etc. They can be identified as belonging to Project HAM because they'll include "Full Scan" or "Full brochure" in their titles and will always be scanned pages, as described above.

So much for the "Prologue". Let's begin ...

Full Brochures

HP Brochure VA004 - It Tells the Time Too - Full brochure      (6 pages, 9.418.281 bytes, in French)

      HP-01. ... et en plus il donne l'heure !

HP Brochure VA005 - HP-01 Una nueva gran aventura - Full brochure      (12 pages, 9.069.011 bytes, in Spanish)

      El increible HP-01 de Hewlett-Packard. Una nueva gran aventura en el tiempo.

HP Brochure VA011 - Pyramid - Full brochure      (20 pages, 10.405.097 bytes, in Spanish)

      HP vintage line of Pocket Calculators. It features images and full information on the HP-21, HP-22, HP-25, HP-45, HP-55, HP-65 and HP-80.

HP Brochure VA062 - HP-37E-38E Nuevas calculadoras para negocios - Full brochure      (8x2 pages, 10.065.411 bytes, in Spanish)

      Le presentamos la nueva generacion de calculadoras para negocios de Hewlett-Packard. La HP-37E para la Gestion Comercial. La HP-38E Financiera Programable Avanzada.

HP Brochure VA101 - HP-35 - Full brochure      (4 pages, 8.204.171 bytes, in Spanish)

      HP-35. Un nuevo calculador de bolsillo con las funciones matematicas mas complicadas incorporadas. Para el cientifico. Para el ingeniero. Para cualquiera que precise calculos complejos y respuestas rapidas.

HP Brochure VA071 - HP-41C - Full brochure      (12x2 pages, 15.015.490 bytes, in Spanish)

      HP-41C. De Hewlett-Packard. El primer sistema de calculo, personal, flexible, ampliable.

HP Brochure VA108 - HP-55 Nuevo calculador cientifico programable - Full brochure      (8 pages, 15.744.213 bytes, in Spanish)

      El nuevo calculador cientifico programable HP-55.

HP Brochure VA130 - HP-71B Una Genialidad Portatil - Full brochure      (4 pages, 4.896.786 bytes, in Spanish)

      HP-71B. Una Genialidad Portatil. Potente, portatil, ampliable, y ademas, en BASIC.

Other Brochure VA021 - Programmable TI-59 - Full brochure      (4x2 pages, 7.399.308 bytes)

      TI Programmable 59. The super-powerful card programmable with TI's revolutionary plug-in Solid State Software modules. Up to 960 program steps. Or, up to 100 memories.

Other Brochure VA060 - Elektronische Rechner - Full brochure      (16x2 pages, 19.307.531 bytes, in German)

      Elektronische Rechner von Texas Instruments. Für zuhause. Schule. Beruf. Studium... Sie.

      Little Professor, TI-1025, TI-1050, TI-1650, TI-1680, TI-1750, TI-2550-III, TI-5015,
      TI-5200, TI-5050M, TI-5040, TI-30, SR-40, TI-41, SR-51-II, TI-Programmer,
      TI-57, TI-58, TI-59, PC-100A

Calculator Programs

HP Program VA340 - HP-34C Matematica Avanzada (with Notes) (Full Scan)      (78 pages, 26.854.844 bytes, in Spanish)

      This Solutions Book was created to enhance the sales of the then (1980) newly released HP-34C calculator, a fantastic advanced programmable RPN model, which was much more affordable than previous advanced models while providing a plethora of useful features both for using in manual calculations and for writing your own programs.

My friend Fernando del Rey and I set up to create a sufficient number of programs to be collected into a new Hewlett-Packard Spanish-language Solutions Book titled "HP-34C Matemática avanzada". In all, we created and submitted a grand total of 18 programs to HP but they selected for publication just the first 16 and the last two were excluded from the book. Now I've righted that wrong by including them at the very end of the book, where you'll also find some interesting Notes on the back story of this HP Solutions Book and my 2021 scanning of it.

This 76-page book features the following 18 programs for the HP-34C (most will run with minor or no changes on the HP-15C):

      CAMBIOS DE BASE   (Base Conversions)
      FACTORES PRIMOS, MCD, DECIMAL A FRACCION   (Factorization, Least Common Divisor, Decimal to Fraction)
      ECUACION DE 4º GRADO   (4th-degree Polynomial Equations, also 3rd- and 2nd-degree)
      SISTEMAS DE ECUACIONES : f(x,y) =0 and g(x,y) = 0   (Systems of two Non-linear Equations)
      AREAS, LONGITUDES, VOLUMENES   (Areas, Lengths of Arc, Volumes)
      INTEGRALES DOBLES   (Double Integrals)
      SUMACION DE SERIES INFINITAS ALTERNADAS   (Summation of Infinite Alternating Series)
      ECUACIONES DIFERENCIALES : y'= f(x,y)   (1st-Order Differential Equations)
      SISTEMAS DE ECUACIONES DIFERENCIALES   (Systems of two 1st-Order Differential Equations)
      OPERACIONES CON NUMEROS COMPLEJOS   (Complex-number Operations)
      OPERACIONES VECTORIALES   (Vector Operations)
      DETERMINANTE, ECUACION CARACTERISTICA, AUTOVALORES DE UNA MATRIZ 3x3   (3x3 Determinant, Characteristic Equation, Eigenvalues)
      INTERPOLACION   (Data Interpolation)
      AJUSTE DE DATOS   (Data Fitting)
      ANALISIS ARMONICO   (Harmonic Analysis)
      RESOLUCION DE TRIANGULOS   (Triangle Solutions)
      TABLAS DE AMORTIZACION   (Loan Amortization Schedule)
      CALENDARIO   (Date and Calendar Operations)

HP Program VA425 - UPLE Program Submittal - HP-41C Sistemas de Ecuaciones Diferenciales (Full Scan)      (9 pages, 3.232.120 bytes, in Spanish)

      Program Submittal to the HP Users' Program Library Europe. Este programa utiliza un metodo de Runge-Kutta de orden 4 para hallar una solucion numerica aproximada de un sistema de N ecuaciones diferenciales de primer orden. Alternativamente, tambien resuelve una ecuación diferencial de orden N. El valor de N solamente está limitado por la memoria disponible.

HP Program VA426 - UPL Program Submittal - HP-41C Reversi (Full Scan)      (14 pages, 3.613.936 bytes, aka Othello)

      Program Submittal to the HP Users' Library (Corvallis). This program allows the user to play a game of Reversi (also known as Othello) against the HP-41C. The present program includes all features required, plays quite well and will easily defeat a beginner. The program itself runs the same with or without a printer, but if one is present, it will print the board.

HP Program VA672 - UPLE Program Submittal - HP-67 Integrales Dobles (Full Scan)      (8 pages, 3.106.463 bytes, in Spanish)

      Program Submittal to the HP Users' Program Library Europe. Versión española del programa #60376D. Calcula la integral doble de una f(x,y) dada entre limites arbitrarios x₀,x_m,y₀,y_n, utilizando un metodo que da valores exactos si f(x,y) es un polinomio de grado 3 (o menos) en x, y y muy buenas aproximaciones en todo caso.

HP Program VA673 - UPLE Program Submittal - HP-67 Sumacion Series Infinitas Alternadas (Full Scan)      (8 pages, 3.424.258 bytes, in Spanish)

      Program Submittal to the HP Users' Program Library Europe. Version española del programa #60582D. Dada una serie infinita alternada cuyo termino general es definido por el usuario, el programa calcula rapidisimamente su suma. Implementa dos metodos: la transformacion de Euler y la transformacion de Hutton. Es posible tratar series divergentes.

HP Program VA674 - UPLE Program Submittal - HP-67 El Juego de los Barquitos (Full Scan)      (11 pages, 6.476.367 bytes, in Spanish)

      Program Submittal to the HP Users' Program Library Europe. A variant of Battleship. Este programa permite al usuario jugar con su HP-67/97 el Juego de los Barquitos. El juego se lleva a cabo en un "mar" 10x10 en el cual la calculadora dispone al azar un cierto numero de barquitos de diversos tamaños. El usuario debe tratar de hundirlos especificando las coordenadas del punto al cual dirige su disparo.

Letters

HP Letter 1979-12-01 - Letter from Valentin Albillo to John McGechie (Full Scan)      (3 pages, 1.208.520 bytes)

      This is the very first letter I wrote back in 1979 to John McGechie (Australian PPC Melbourne Chapter) when I was a very young adult and still at High School. At the time, I was but a fledgling HP-calc user with rudimentary self-taught English, but already bitten to the core by the HP bug. Includes Notes.

HP Letter 1979-12-19 - Letter from John McGechie to Valentin Albillo (Full Scan)      (7 pages, 1.769.472 bytes)

      This was John McGechie's handwritten 6-page reply to my very first letter to him, where I unashamedly asked him zillions of questions, as an interested but total newcomer to the 1979 HP calc scene was bound to do. Includes Notes.

Raw Scans

HP Raw Scan - Boletin #0 Club Usuarios Calculadoras HP Barcelona (Full Scan)      (33 pages, 13.177.030 bytes, in Spanish and others)

      This 32-page magazine arrived 1983-10-01 in a big envelope by regular mail sent from Barcelona (Spain). They sent me their #0 issue, which features an interesting mix of programs, routines, hint, tips, articles and even some adds, mostly for the HP-41C in this particular issue, including data sorting, artificial satellites' tracking, synthetics, polynomial arithmetic, "alien" games, special functions and numeric analysis, etc., in both Spanish and other languages. Includes HP-41C barcodes for the programs featured and Notes.

HP Raw Scan - A Blackbox Handbook to Synthetic Programming Techniques (Full Scan)      (16 pages, 3.133.875 bytes)

      A 16-page booklet by Phill Jury (PPC #5484) which was sent to me by John McGechie (PPC Melbourne Chapter) circa 1980, and which I've discovered recently among my 40+ year-old vintage materials so I thought it would be proper to scan it and upload it to this Section as well. Phill says:

      "This book is designed to teach the person who has neither the time nor the inclination to learn how the 41C goes about carrying out various non-standard techniques, but explains in detail (step by step instructions), how to use these techiques". Includes Notes.

HP Raw Scan - HP Advanced Programmable Calculator Survey (Full Scan)      (12 pages, 2.955.836 bytes)

      This arrived as a thick 1977 letter from HP "sent to only a few HP-67 and HP-97 owners", encouraging us to take a very comprehensive survey and then send the completed questionnaire back to them. The large envelope included a one-page letter plus the survey's questionnaire proper, which consisted of 8 pages featuring 36 quite complex and detailed, very specific questions. Oh, and a return envelope as well. Includes Notes.

HP Raw Scan - ENTER contra Igual (Full Scan)      (8 pages, 6.663.984 bytes, in Spanish)

      ENTER contra IGUAL. Calculadoras cientificas de bolsillo - La verdadera historia. Una discusion practica, problema por problema, de los sistemas logicos usados en las actuales (ca. 1977) calculadoras cientificas de bolsillo.

HP Raw Scan - A Guide to Profitable Decision Making (Full Scan)      (28 pages, 37.699.863 bytes)

      A Guide to Profitable Decision Making - Hewlett-Packard’s introduction to basic financial concepts every business manager should know. DECISIONS - the single most important factor facing a manager. This guide is about time and money.

Computer Programs

HP Computer Program VA020 - XLATOR - Convertidor Series 80 a Series 200 (Full Scan)      (21 pages, 5.629.539 bytes, in Spanish)

      This Series 200 BASIC program, XLATOR, was created by me to automate the conversion of Series 80 programs (HP-86/87) to Series 200 (HP 9816/26/36). XLATOR is a 1,179-line Series 200 BASIC program which runs on the HP 9816/26/36, accepts as input a Series 80 BASIC program (which can use a number of binaries) and produces the equivalent Series 200 BASIC program as its output. Includes Notes.

HP Computer Program VA030 - HP-86-87 CMAT - Operaciones Matriciales con Strings (Full Scan)      (12 pages, 3.579.912 bytes, in Spanish)

      The HP-86/87 binary, CMAT 1.0, was created by me ca. 1985. It consists of 644 lines of Capricorn assembler code which I wrote to speed up our engineering programs without requiring our clients to buy the very expensive and hard-to-get Matrix ROM(s). CMAT implements 32 (somewhat ad-hoc) matrix functions and statements using strings (say Vertical_Loads$) instead of array variables. Includes Notes.

... plus some pertinent Maintenance:

HP Article VA038 - DOMINOKU – Swiftly Solving Domino Grids

HP Picture VA710 - HP-71B

\begin{array}{|c|c|} \hline Notice \\\hline \end{array}

I'll appreciate it very much if you would please refrain from posting anything to this thread, so that it only contains the update announcements and listings themselves and nothing else. If you want to comment something please create another thread or PM me for any questions or comments you want addressed. Thanks.

Last but not least

Well, as you can see, Project HAM requires a really, really huge amount of effort. Scanning those 2,000 pages in a cheap, slow scanner will take many man-weeks (VA-weeks), as will carefully post-processing them to enhance their fading quality (ER-weeks).

So, though Project HAM will continue whether you show some interest in its materials or not, it would be nice to see a degree of interest on your part, in the form of a significant number of downloads, and/or a significant number of comments (not on this thread, please, create some other !), and/or a number of links/mentions in your own web sites or elsewhere you may refer my site to. Remember, neither me nor Eric make a cent for this.

Else, this time your lurking and your having interest but never taking the effort to do any of the above or posting any kind of feedback (you're just too lazy or too busy, etc. ...) won't do and this would be the last time I take the extra effort to announce any updates. Just see the length and complexity of this very post, if in doubt about the effort required to make detailed, useful announcements.

I sincerely hope that won't be necessary. But if not, well, C'est la vie !

V.

Valentin Albillo · (This post was last modified: 09-21-2022 01:50 PM by Valentin Albillo.)

Well, no feedback received at all since my previous announcement so C'est la vie !, then.

From now on I'll announce all Updates to my site in this very post, which I'll edit as needed to add the most recent ones. Thus, this post will appear just once (and never again) at the top of this General Forum, so not bothering uninterested people. Conversely, those interested should bookmark and revisit this post and/or my site regularly to be aware of new updates.

The latest updates are:

  #Upd    Date     Files  Pages    Mb   Contents/Remarks
   28  2021-09-13   25     402    230    18 HP-34C progs, 10 Full brochures, 2 HP-41 progs, 3 HP-67/97 progs,
                                         2 vintage letters, 1 HP-86/87 binary prog, 1 9816/26/36 prog, 5 Raw Scans

   29  2021-10-13   99     654     60    84 HP-67/97 UPL (USA) programs, 7 HP-67/97 UPL (Europe) programs,
                                            HP-35 Capability Study, HP-35 Carta y Folleto

   30  2021-10-26   79     563    124    64 HP-67/97 UPL (Europe) programs, 1 HP-41 UPL (USA) program, 4 Full brochures,
                                         4 vintage letters, 2 Computer Raw Scans

   31  2021-11-07   33     208    164    40 HP-25 programs, 10 Full brochures, 19 HP Book Covers, 3 Raw Scans

   32  2021-11-17   35     265    221    30 HP-67/97 programs, 1 Other program, 4 Full brochures,
                                         5 vintage letters, 21 HP Book Covers, 3 Raw Scans

   33  2021-11-27   31     243    134    27 HP-34C programs, 5 Full brochures, 20 SHARP Book Covers, 4 Raw Scans,
                                         1 Easter egg

   34  2021-12-07   40     202    239    5 HP-41 UPLE progs, 7 Full brochures, 20 Book Covers, 4 Raw Scans, 4 Easter eggs

   35  2021-12-17   42     200    175    7 Full brochures, 7 Raw Scans, 7 Easter eggs, 21 Book Covers

   36  2022-01-17   36     463    313    2 HP-41C progs, 9 Full brochures, 11 Raw Scans, 3 Book Covers, 6 vintage letters,
                                         5 Easter eggs

   37  2022-02-05   22     160    120    19 HP-55 progs, 4 Full brochures, 8 Raw Scans, 3 Book Covers, 5 vintage letters,
                                         2 Easter eggs

   38  2022-03-05   26     191    189    16 HP-67 progs, 9 Full brochures, 3 Raw Scans, 4 Book Covers, 6 vintage letters,
                                         4 Easter eggs

   39  2022-09-22   20     304    139    70 HP-41 progs, 5 Full brochures, 2 Raw Scans, 3 Challenges, 5 vintage letters,
                                         4 Easter eggs

   Totals:         488   3,855  2,108      96.38% of Project HAM already completed & 1,110 files available now at my site.

Maintenance:
- None.

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V.
Edit: Update #39 added