HP Forum Archive 09

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Two interesting PPC TN articles Message #1 Posted by Ex-PPC member on 9 Jan 2003, 7:40 a.m. Hi, I've just found a couple of very interesting articles, in PDF format, and thought you might like to have a look at them, specially since vintage Australian publication PPC Technical Notes' issues aren't exactly easy to come by. Chris Rath is the author of both articles, and these are his own descriptions and links. Best regards to all forum participants. Tic-Tac-Toe Algorithm & HP-41c Implementation —published in PPC Technical Notes #13, late 1982. I created this algorithm and code during early 1981 while learning to repair ground RADAR at the Canadian Armed Forces’ Electronics School in Kingston. For many months I had been promising the PPC TN’s editor that I would write up and submit an article; hence the gap between the writing of the program and the publication of the article. HP-41c Microcode Programming —published in PPC Technical Notes #15, early 1984. In early 1983 I was invited to give a talk at an upcoming gathering of Hewlett-Packard calculator enthusiasts. Over the preceding couple of years a number of my letters and articles had been published in both The PPC Journal and PPC Technical Notes, and the primary focus of these writings had become microcode programming of the HP-41c calculator. This article is an annotated version of paper I wrote and presented at the Rhode Island conference on 1983/05/07–08 (the annotations are by John McGechie and Michael Thompson).

Re: Two interesting PPC TN articles Message #2 Posted by andy on 9 Jan 2003, 9:19 a.m., in response to message #1 by Ex-PPC member Do you have the rest of these PPC TN in .pdf format? Andy

Re: Two interesting PPC TN articles Message #3 Posted by Ex-PPC member on 9 Jan 2003, 9:50 a.m., in response to message #2 by andy Sorry but no, those materials aren't mine, they reside in the Rath Family's web site, I just happened to find them while browsing the web, and thought it would be nice to share that finding with all the people in this forum. Perhaps you could try contacting Chris Rath himself and ask him if he would be willing to make available more articles from the mythical and extremely hard-to-find PPC TN issues. Best regards.

Please, Sir, I'd like some more, too... Message #4 Posted by Vieira, Luiz C. (Brazil) on 9 Jan 2003, 2:49 p.m., in response to message #3 by Ex-PPC member Hi, Ex-PPC member; good reading your posts again. After reading briefly the Microcode-related PDF, I could understand some of the ROM listings. As you mentioned here, there is no more of it from the source you grab them, so I'll not ask for it. Anyway, I'd like to thank you. As a "mysterious" fella, the HP41 internals (SW more than HW) still amuses us all since Jully 16th, 1979 (D.O.B., right?). And part of this is revealed now. Best regards.

Re: Please, Sir, I'd like some more, too... Message #5 Posted by Ex-PPC member on 10 Jan 2003, 11:05 a.m., in response to message #4 by Vieira, Luiz C. (Brazil) I've seen no other documents on 41C microcode in the web not already present on the usual sites, but perhaps you haven't seen these HPcalc-related .PDF documents yet: Introduction to Programming the HP48G/GX calculators An elementary introduction to programming the HP 48G and 48GX calculators, quite good and extensive. Includes lots of examples and exercise sets, ideal for newbies and teachers wanting to introduce their class to these powerful HP calculators. (25 pages) Newton's method on an HP48 calculator Newton's method on an HP48 calculator, using symbolic derivatives. Demonstrates nicely some of the advanced capabilities of the 48 series, including the use of the stack, symbolic computations, input forms, etc. (9 pages) Programs for the HP-28S An extensive collection of short, mathematical programs and routines in RPL for the HP28C/28S, probably also compatible with other RPL models. (17 pages) Best regards.

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