Recently Added

12/28/24

• Fixed some typos in "How the Model 9100A Was Developed" Thank you, Giacomo De Bello!

11/02/24

• Updated the record for HP-12C original battery life from 30 to 34 years! Thank you, Curtis Covington!

2/24/24

• Added an earlier serial number for the HP-17B. Thank you, David Neese!

11/06/23

• Fixed a keycode error in the 19C/29C moon lander program. Thank you, Greg!

4/30/23

• Added an earlier serial number for the HP-19BII. Thank you, Dale Gunns!

4/17/23

• Updated the simulations pages to HTML5 and cleaned up broken links, warned that the Java applets are unlikely to work, etc. Thanks to Martin Hepperle for reporting the broken links.
• Added a picture showing an HP-80 next to a prototype version. Thank you, Scott Reynolds!
• Added a close up picture of the instruction sheet under the HP-9810 printer cover.
• Updated the record for HP-12C original battery life to 30 years! Thank you, William Arthurs!

4/16/23

• Added two pictures of the HP-35 back label in Dutch. Thank you, Ad Sprenkels!
• Fixed omissions in the HP-80 (compare) features list. Thank you, Jeff Woolsey!
• Added an earlier serial number for the HP-12C. Thank you, Tom Drewski!
• Corrected some typos. Thank you to multiple people!

6/08/21

• The main original software library has been updated to the new style. This means everything in the original software libraries except the HP-41C library is now updated. Every program was looked through (to varying extents). Typos were fixed, notes were added, code was reformatted and "normalized" to some extent (though various authors still have different styles.) It's hard to get all these programs for calculators that are generations apart to be consistent. For older models, I decided that keystrokes should look like keys, but for the HP-41C, I am going to keep them as they show in that model's segmented alphanumeric display. So, for example, steps that show as x⇔y, ÷, and x² in an HP-67 listing will be X<>Y, /, and X↑2 in an HP-41C listing.
• The (huge) HP-41C library hasn't been done yet. It's hard to predict how long it will take both because it is huge and because my friends and family have been vaccinated, which makes my summer less predicable than it once seemed.
• There are still a few other non-updated pages as well. For example the simulators pages. Sadly, many of the simulators there are written in Java - once the up-and-coming language but now unsupported in most browsers. If you wrote any of these, and have ported them to something currently-supported, please let me know.

5/7/21

• Uploaded version 4 of the MoHPC fonts and added some additional text about working with alpha mode to the HP-41C Programming page. The new characters added are: ⊢ and ᵀ which will be well-known to 41C programmers. I noticed that Firefox keeps on using old fonts even after reloading the page and even after forcing a reload of the css file. The only way I have gotten it to switch to new font versions is to close it and re-open it. I guess they didn't expect fonts to change often (and I keep hoping I am "done" with these fonts so I hope they don't change much in the future.) I don't know if other browsers have this "feature".
• The addition of ⊢ and ᵀ were in preparation for updating the original software libraries which are still a work in progress. Because there are so many pages and the pages were submitted by people all over the world, this is taking some time. Since the server is now declaring all pages to be UTF8, that works great for pages originally written in ASCII but is breaking some of the pages that were contributed by other people using other code pages and characters above 0x7F. (Sorry - working on them...)

4/22/21

• Fixed 3 listings in the HP-95C Software Library to use combining macrons instead of spacing macrons. (Learning Unicode is still a work in progress for me.)

4/21/21

• Updated the HP-95C Software Library page to the new style and added comments to the program listings.

4/07/21

• Updated the features pages and the compare features page to the new style.

3/29/21

• Rebuilt the main pages of the museum moving from 1995 HTML which was meant to run on Netscape, Mosaic, etc. to modern HTML/CSS. Moved from default system fonts with ASCII/ANSI text to downloadable UTF-8 fonts (allowing things like x≠y?, R↑, x⇔y, ▲, √, ↱, and Σ+ without trying to create and embed lots of tiny GIFs as I once did), Found and fixed some spelling and grammar errors along the way. So far, the main page, All of the HP model pages (left half of the main screen), the Programming pages, the HP Journal pages, and the HP Advertisements have been updated.
• Many of the links from the right side of the main page have been updated as well. (Though there are still hundreds of files left to be done...) The Software libraries are the largest sections that haven't been updated yet.

1/16/20

• Added a photo of another HP-35 prototype (third prototype version) to the HP-35 page. Thanks to Scott Reynolds!

11/09/19

• Added an Italian back label to the HP-35 page. Thanks to Paolo Cipollone!
• Added benchmarks for the HP-48G written in Saturn assembly language. Thanks to Jonathan Busby!
• Various bugs fixed. Thanks to Jack Rubin, and Torbjörn Lindh for spotting them!

4/13/19

• Since the last update I've been quite busy, but I finally got to do some refreshing. By popular demand from the HP Forum, the website is now encrypted/SSL'd. In addition I went through and updated the links and associations page, added a lower serial number for the HP 48SX and updated my bio a bit.

10/13/16

• Added several earlier serial numbers to the collector's corner and fixed minor bugs, typos and incorrectly listed features on the HP-22, 33, 41, 80, 81, and 9820 pages. Thanks to Alan, Topi, Paulo, and Bernhard! Keep those fixes and serial numbers coming!
• Updated the HP-35 simulator with a bug fix from Hans Klaver. Thank you Hans!

2/6/2016

• Updated the HP-10C page with a new record for battery life - 34 years!

12/2/14

• Document Set Version 8 is now available. This adds about 2GB of scans beyond the contents of Version 7. Since we have moved from multiple DVDs to a USB drive, all of the files are immediately available with just a click from the start page.
  

11/24/14

• Document Set Version 8 is now in beta testing and will be available very soon. This doesn't affect people who need a single manual or two that are already on Version 7, but if you want a full and current set - it's probably best to wait a few days.

12/11/13

• Added brand new forums.

05/26/13

• Added 6 HP-35S programs to the software library. Thanks to all the program contributors!

05/03/12

• Added a picture of a Finnish Back label to the HP-35 page.

02/14/12

• Added more than 50 programs to the software library and the HP-41C library. Thanks to all the program contributors!

11/18/09

• The new DVD Set Version 7 is now available. This version expands the collection to about 1400 documents. (More than 12GB of data.) Most documents have also been made searchable in this version by an OCR process. (The OCR text is invisible so OCR mistakes do not affect the appearance.)

4/15/09

• Added a tour of the HP Garage.
• Added an even earlier prototype to the HP-35 page.
• Added a picture of an HP-01 Proof of Concept to the HP-01 Page

7/16/07

• Added 21 New programs such as "Numerical Differentiation", "Osculating Polynomial", "Kaprekar Series", "The Laplace and Poisson Equations", "The Diffusion Equation", "The Bulirsch-Stoer Method ", and "Special Relativity" to the HP-41C library and updated 13 programs in the HP-41C library. Thanks again to Jean-Marc Baillard!

7/01/07

• Added HP-33C and HP-32SII programs to the software library. Thanks to Bill Harrington, and Andy Schick!
• Added 3 HP 50 and 1 HP-48G programs to the software library. Thanks to Eddie Shore, and Ed Look!

6/23/07

• Added HP-12C and HP-34C Moon lander programs to the software library. Thanks to Richard Beal, and Ed Look!

08/23/06

• Added 17 New programs and updated 12 programs in the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added an HP-12C and an HP-15C program to the software library. Thanks to Paul Dale!
• Added an HP-25 program to the software library. Thanks to Bill Harrington!
• Added 2 HP-33E/C programs to the software library. Thanks to Glenn Hayhurst and Joel POUTEAU!
• Added an HP-33S program to the software library. Thanks to Ed Mooney!
• Added an HP-38C program to the software library. Thanks to Gerson Washiski Barbosa!

12/12/05

• Added 6 and updated 6 programs in the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added 6 HP-71B programs to the software library. Thanks to Namir Shammas!
• Added 3 HP-42S programs to the software library. Thanks to Brett Stevens, Gerald Hillier, and Gerson W. Barbosa !
• Added an HP-9810 program to the software library. Thanks to Johnny Nestor!
• Added an HP1-5C Simulator and a newer version of WRPN (HP-16C) to the Simulations Page. Thanks to Torsten Manz and Emmet Gray!
• Added a HP-65 HP-67 HP-97 "Clutch" Fix article to the repairs section. Thanks to Johnny Nestor!

8/1/05

• Added 1 and updated 2 programs in the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added 1 and updated 2 HP-33S, HP-32S and 32SII programs to the software library. Thanks to Karl Schneider and Eric Lundgren!

6/25/05

• Added 9 programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added an HP-16C program to the software library. Thanks to Neil Redmond!
• Added 3 HP-32S and 32SII programs to the software library. Thanks to Karl Schneider and Eric Lundgren!
• Added an HP-33S program to the software library. Thanks to Eddie Shore!
• Added an HP-67 program to the software library. Thanks to Dirk Zabel!
• Added a picture of an HP-35 back label in Spanish. Thanks to Arnaud Amiel!

6/2/05

• The new DVD or 10 CD Set is now available. This version expands the collection from more than 450 to more than 725 documents. (More than 6GB of data.) Thanks to many people for scanning help! (List & Credits).
• Now that the DVD is done, I'm getting back to a forum software update and I'll be adding some more volunteered calculator software in the near future.

2/25/05

• Added pictures of HP-35 and HP-65 prototypes.
• Added information about how HP handled the HP-35 bug.
• Added development information about the HP-35, 65 etc.
• Added "The Case: rebuilding the benchmark" and information about the keyboard to the HP-9100 page.
• Thanks to HP/Aglient engineers Bill Boller, Bob Taggart, Dick Osgood, Dave Cochran, and Sandeep Bahl for the above information.
• Added 4 programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added another program to the HP-41C library. Thanks to Geir Isene!
• Added a 32SII program to the software library. Thanks to Gerson W. Barbosa!
• Added some more battery info. Thanks to Andrew!

12/13/04

• Added 15 programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added a 32S program to the software library. Thanks to Peter Niessen!
• Added many new HP-9100, HP-9805, HP-9815, HP-46, HP-81, and Series 80 pictures.

7/5/04

• New software:
  • Added many new and two improved programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
  • Added an improved 32SII program to the software library. Thanks to Karl Bédard!
  • Added a new HP-32SII program and an HP-42S program to the software library. Thanks to Pauli!
  • Added a new HP-16C program to the software library. Thanks to Jamie Cox!
  • Added a new HP-11C program to the software library. Thanks to Klaus!
  • Added a new HP-42S program to the software library. Thanks to Erik Ehrling!
  • Updated Neil Fraser's HP-35 simulation. Thanks to Thanks to Klaus! (done/up)
  • Updated Leo Duran's HP41UC utility. Thanks to Leo Duran! (done/up)
• Added many new HP-9810, HP-9820, HP-9825 and HP-9830 and related peripherals pictures.
• Added two prototype pictures to the HP-01 page.
• Added more details about unreleased models.

1/14/04

• Added 31 new HP-41C programs (Home Const. Estimating and Optometry 1 & 2) to the HP-41C library. Thanks again to Tony Duell!!
• Added a 32SII program to the software library. Thanks to Karl Bedard!
• Added a 29C program and a 32SII program to the software library. Thanks to Adam Szporer!
• Added a 75C program to the software library. Thanks to Emmanuel Compès!

11/26/03

• Added three programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added two 10C and two three 32SII program to the software library. Thanks to Tizedes Csaba!
• Added two more 32SII programs to the software library. Thanks to Charles L and Eric C. Lundgren !
• Added two HP-42S program to the software library. Thanks to Gerald Hillier and Ron Ross!

9/18/03

• Added internal information about Classic Series calculators and HP chargers to the Articles Forum and linked them into the repairs page. Thanks again to Tony Duell!!
• Added four programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added another program to the HP-41C library. Thanks to Wouter Peters!
• Added a 32SII program to the software library. Thanks to Tizedes Csaba!

9/10/03

• Opened the HP-95C Software Library and added all 44 programs from the HP-95C Applications Book. Thanks to André Wilhelmus!

8/15/03

• Added three programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added two HP-42S programs to the software library. Thanks to Juergen Keller!
• Added the HP-48S and SX
• Expanded the HP-28 description and upgraded the images
• Expanded the HP-18C description and upgraded the image.
• Expanded the RPL page

6/5/03

• Added five programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added another program in German to the HP-41C library. Thanks again to Rolf M. Kocher!
• Added a new HP-32SII program to the software library. Thanks to Tizedes Csaba!
• Linked several new articles into the repairs page. Thanks to Norm, Katie, Luiz, Mark and others!
• Added a German Back Label Picture to the HP-70 page. Thanks to Matthias Wehrli!
• Added the ability for posters in all forums to go back and edit their posts (if they passworded them.) (This was actually added earlier.)

2/28/03

• Added a note about the development of the HP-35 manual. Thanks to gaylord tefft! (the author)
• Added a note about the toughness of the HP-12C (passing through a hippopotamus.) Thanks to Fred Stone!

2/23/03

• Added three programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added four programs to the software library. Thanks to Glen Kilpatrick!
• Added two more programs to the software library. Thanks to Alex and to Pierre GILLET!
• Added a listing of the HP-71 programs in hpswap/lexfl1.gz to the Museum FTP site. Thanks to Andy Delano!
• Added an HP-16C-like program to the simulations page. Thanks to Eric Malafeew!

1/20/03

• Added a SysRPL benchmark to the benchmarks page. Thanks to Frido Bohn!

1/11/03

• Added Randy Sloyer to the repairs page.

12/17/02

• Added the Xpander prototype.
• Added the HP-67CX prototype.
• Added two programs to the HP-41C library. Thanks to Jean-Marc Baillard and David Erdman!
• Added two programs to the software library. Thanks again to Raúl Lión Arrese!
• Now taking orders on 7 CD and 1 DVD sets for shipment in January.

12/08/02

• Added two programs to the HP-41C library. Thanks again to Jean-Marc Baillard!
• Added a program to the software library. Thanks to Raúl Lión Arrese!

10/03/02

• Added a program to the software library. Thanks to Gordon Dyer!
• Added three programs to the HP-41C library. Thanks to Jean-Marc Baillard and Russ Gilbert!

06/19/02

• Added 60 new pictures. These are mostly three quarter views of most of the handheld models. There are also a few rear views.

06/16/02

• Added a four new programs to the software library. Thanks to Pascal Fellerich!
• Added a poker program to the HP-41C library. Thanks to Jean-Marc Baillard!

06/06/02

• Because there was some disagreement about the value of auction advertisements, added an optional Auction-free view of the classified ads. If you like seeing all advertisements, please continue to use the original view.

06/01/02

• Added three programs to the HP-41C library. Thanks to Jean-Marc Baillard!
• Added a netmask program to the software library. Thanks to Borja Marcos!
• Added an HP-35 back label in Danish to the HP-35 page. Thanks to Johnny Bjorn Rasmussen!

04/28/02

• Added 15 new HP-41C programs (Filters and Space Science) to the HP-41C library. Thanks again to Tony Duell!!
• Added another program (Phases of the Moon) to the HP-41C library. Thanks to Jean-Marc Baillard!

04/07/02

• Added 45 new HP-41C programs to the HP-41C library. Thanks again to Tony Duell!!
• Added 3 new HP-42S programs to the main library. Thanks to Richard Garner!
• Added 2 more programs to the HP-41C library. Thanks to Jean-Marc Baillard!
• Added 2 new HP-32SII programs to the main library. Thanks to Ben Salinas!

02/06/02

• Added 6 programs by Glen Kilpatrick to the software library. Thanks to Glen!

12/17/01

• Added an HP-35 back label in Swedish to the HP-35 page. Thanks to Per Faltman!

12/15/01

• Added a note about cheap calculators in 2001 to the collector's corner. Thanks to Matthias!
• Added an HP-35 back label in Japanese to the HP-35 page. Thanks to Yoshinori KIMATA!

12/11/01

• Added 67 new HP-41C programs to the HP-41C library. Thanks again to Tony Duell!!

10/21/01

• Added the Biographies Forum. Please feel free to tell us about yourself.

09/12/01

• Added a picture of an HP-35 back label in French. Thanks to Pierre Brial!

08/13/01

• Added an HP-35 simulator. Thanks to Neil Fraser!

06/29/01

• Added a Feet/Inch calculator to the HP-41C library. Thanks to Fred E. Lusk!
• Added a Windows interface for hp41uc to the HP-41C library. Thanks to Ulisse Quadri!
• Benchmarks for the HP-49G were added Thanks to Marco G. Salvagno

03/19/01

• Added Adobe Acrobat (PDF) Barcode pages for most of the games in the HP-41C library. Thanks to Brian Ward! These pages are particularly useful to people without the appropriate hardware to run the barcode printing programs.

02/19/01

• Added the HP-41C Games Pac programs to the HP-41C library. Thanks to Chris Johnson!
• Added the HP-41C Fruit Machine (Slot Machine) game to the HP-41C library. Thanks to Brian Ward!
• Be sure to check out the recent postings in the Articles Forum and HP Memories Forum. Thanks everyone!

12/05/00

• Added Hans Brueggemann's "Polynomial Curve Fitting for HP-41CX" program to the HP-41C library. Thanks Hans.

11/22/00

• Added 22 new HP-41C programs to the HP-41C library. Thanks again to Tony Duell for uploading the binaries and to Leo Duran for his compiler/decompiler.

10/26/00

• Added several hundred new HP-41C programs. Created a separate HP-41C library. Thanks to Tony Duell for uploading the binaries and to Leo Duran for updating his compiler/decompiler to work with them. Leo's program was used to create the .dat files for serial downloads and the listings for keypad entry. Binaries are also on-line for downloading via LIF disks or the PC to HP-IL card.

7/24/00

• Added Leo Duran's User-Code File Converter/Compiler/De-compiler/Bar-Code Generator for HP-41s and PCs. Thanks Leo!
• Added a Java HP-45 Microcode simulator based on Eric Smith's C version. Thanks Eric!
• Added a page on Classic calculator CPU design and internal programming.

7/21/00

• Added a (new) indicator to the HP forum and a daily view. The daily view shows recently posted messages with the newest at the top - a form that some frequent visitors prefer.

7/11/00

• Added new programs by Bill Duncan to the software library. Thanks Bill!
• Converted Steve Loboyko's How To Fix Classic Models document to HTML and added it to the repairs page.

5/26/00

• Added a Time Manager program to the software library.
• Several new articles have been recently added to the Articles Forum and HP Memories Forum.
• Please take a look an let the authors know that you appreciate the work!
• I received a multi-drive CD duplicator today. I'll be taking next week off from work to catch up on backorders due to the problem with Masterdisc.

4/7/00

• Added the formatting features to the Articles Forum.

4/3/00

• Added the Articles Forum for in-depth articles from museum guests.
• Added the HP Memories Forum
• Please contribute to the above pages!

3/11/00

• Added a new guest memory.
• Added a new battery tip.

1/30/00

• Added feature pages for most calculators and a comparison feature.

1/17/00

• Added the actual benchmark code to the benchmarks page along with a simple speed / dollar measurement.

1/04/00

• Added a new guest memory by Barry Williams.
• Added a Hexadecimal <> decimal converter by Michael Harwood and Paul Picot.
• Added a Fitter program by José Manuel Pérez, Xose.

12/12/99

• Added a Pioneer repair article by Paul J. Brogger.

12/4/99

• Replaced more than 50 scans in the Pre HP adding/calculating machines, cylindrical slide rules and early HP desktop sections (98xx and 9100). The new scans are generally more detailed and/or have more accurate color and contrast.
• Added thumbnails to the same sections.

10/9/99

• Added a new planimeter simulation.

10/2/99

• Requested volunteers for scanning the next version of the CD ROM set - 4 CDs are planned.

7/11/99

• The new ads system is now online.

7/05/99

• Added an archive for older HP forum articles.

5/29/99

• Added new HP-41C and 71B programs to the Software Library.
• New articles and memories added to the guest contributions section.

4/28/99

• Museum CDs may now be purchased online.

4/24/99

• Back label scans of the 35, 45, 55, 65, 67, 70, 80, 10C, 11C, 15C, 16C, and 41C added.
• Internal pictures of the 32S and 42S from Paul Brogger added.

4/14/99

• Museum CDs may now be purchased via credit card.

3/03/99

• Scanned HP manuals are now available individually.

1/30/99

• The expanded Museum 2 CD set is now available!

1/25/99

• Added two guest contributions.
• Added two programs to the Software Library.
• Orders will be taken for the two CD set at the end of January.

12/13/98

• Added a new guest memory.
• Added two programs to the Software Library.
• More items added to the expanded Museum CD. (Volunteers still needed.)
• Larger pictures of the 20" long K&E 4053-5 and 2' long Gunter rules.

11/03/98

• More items added to the expanded Museum CD.

10/24/98

• Added disassembly instructions.
• Added HP-27 and HP-19C/29C brochures.
• Added five new guest memories.
• Added pictures of the HP-55, 70 and 80 interiors and the HP-32S anniversary model.
• You should now be using the www.hpmuseum.org to get to the museum. There are still pages on teleport, but they are no longer being updated.
• The next update will be the expanded Museum CD coming in November. (Two more calculator manuals have been scanned.)

10/14/98

• Added information on the upcoming expanded Museum CD with applications pacs and manuals.
• You should now be using the www.hpmuseum.org to get to the museum. There are still pages on teleport, but they are no longer being updated.

9/27/98 Status and upcoming events.

• The museum will soon be leaving Teleport and will only be accessible at www.hpmuseum.org. This was due to stability problems at Teleport followed by their insistence that a "one time only $50 fee" for having a domain name on Teleport must now be (re)paid once per month. Most of my spare time has been spent finding a new provider and getting set up so I must apologize for getting behind on email requests.
• Teleport also added a new fee to run scripts so as of 9/27/98, the museum search and forum features are now running on a new machine. It's providing better performance than the old Teleport machines but with the web site now being partly redirected to a different machine, there could be glitches. Please let me know.
• Added ad categories and an easy way to delete individual ads.
• The rest of my spare time is currently spent scanning application pacs for the museum CD. Watch for an announcement soon.

8/1/98

• Added five new HP memories.
• Added three HP-38C programs to the Software Library.
• Added articles on the HP-01 and HP-65 card reader to the HP Journal Library.
• Added a fourth (and final?) HP-01 version picture and modified the variations notes.
• Added additional HP-65, 75, 9815, and 9820 pictures.
• Added Earliest Serial Numbers (seen so far) to the collector's corner. (Please send yours!)
• Added many pictures from HP to the photo gallery.
• Added the CD offer.

6/10/98
Teleport (my ISP) made additional "improvements" causing all scripts to fail. More work-arounds installed.

5/30/98

• Added 10C series technology and packaging.
• Added HP-33E/C programming instructions.
• Added 5 HP-33C/E programs to the Software Library.
• Added HP calculator benchmarks to the technologies section.
• Added two new HP memories.
• Expanded the HP-94 description.
• Added an HP-35 brochure to the advertising section.
• Added internal pictures of the HP-65, HP-92, HP-97S, HP-9815 and HP 9820.
• Expanded the HP-65 and HP67/79 exhibits.
• Added a transparent HP-65 to the photo gallery.
• Added more HP-01 pictures and HP-01 variations to the collector's corner.
• Improved picture of the HP-9100 with printer attached.

4/20/98
Teleport (my ISP) made "improvements" causing all scripts to fail. Work-arounds in place. Please let me know if you have any further problems.

4/12/98

• Opened the HP Forum.
• Added HP variations and code names to the collector's corner.
• Added options/accessories to the HP-41C.
• Added an X-Ray picture of the HP-75C to the Photo Gallery.
• Added a new HP memory.
• Added more photos of the Friden EC-132.

3/27/98

• Opened the Photo Gallery which shows new scans supplied by HP and collects many of the Museum's images into one place.
• Added a new HP memory.
• Added a new HP-25 Brochure.

3/6/98

• Added the HP-46, 56, 66, and 9805 design and color studies.
• Added the HP Advertisements section with 28 ads from the 60s and 70s.
• Added better scans of the HP 9815, HP-70 and HP-27.
• Added a better closeup scan of the HP-01.
• Added several internal photos of the Friden EC-132.
• Added two new HP memories.
• Added a note on the HP-9805 case material.

2/17/98

• Improved Scans of the HP-10C, 12C, 15C, 16C, 22S, and 94F.

2/7/98

• Added the Friden EC-132 (a 1964 almost-RPN calculator) and updated the RPN Versions page.
• Added RPN instructions to the RPN page.
• Added six articles on the HP-41C to the HP Journal Library.
• Added two programs to the Software Library.
• Added an HP-41C simulation to the simulations page.
• Added information on the HP-32S solver.
• Expanded the HP67/79 description.
• Added a new HP memory.
• Added the programming and technologies pages for easier navigation.
• Improved images of the HP-22, 27S, 32S and 33C.
• Added search features.
• New address: www.hpmuseum.org (The old one still works too.)
• Many small changes and updates.

12/7/97

• Added information about HP-41C Synthetic Programming.
• Added 7 articles on the HP-71B to the HP Journal Library.
• Added another program to the Software Library.
• Added a new HP memory.

11/17/97

• Added 8 articles to the HP Journal Library.
• Added the first HP memory to the Guest Contributions area.

11/3/97

• Added the elusive HP-95C. A scientific programmable calculator with "Partition Programming".
• Opened the HP Journal Library.
• Updated the Software Library.

10/26/97

• Opened the Guest Contributions area.
• Added HP-41C/CV/VX and HP-9100A/B programming information.
• Added a fantastic Java simulation of an HP-25.
• Added 28 programs to the Software Library.
• Improved the scan of the HP-46 and added a picture of an HP-41C barcode wand.

9/5/97

Added HP-25, HP-29C/19C, HP-55, HP-65, and HP-67/97 programming information. Added new programs to the Software Library.

8/20/97

Added a simulation of an HP-16C for Microsoft Windows.

8/6/97

Added the "HP-65 In Space" advertisement to the HP-65 exhibit.

8/2/97

Price ranges were added to the Collector's Corner. Minor updates on pricing and buying where made there and on the frequently asked questions page.)

An article on adding a crystal to the HP-45 was added as was information on HP batteries, and chargers.

Images for the Space War game fixed.

7/20/97

Added new programs to the Software Library.

7/12/97

Added the 50th Anniversary Special and replaced the scan of the HP-91.

6/20/97

Added a link to HP's 25th Anniversary of the HP-35 pages.

6/17/97

Opened the new Software Library.

Sharper scans of many models (HP-10, HP-11C, HP-19C, HP-21, HP-25, HP-28C & S, HP-29C, HP-31E, HP-32E, HP-34C, HP-37E, HP-38C, HP-41C, HP-42S, HP-45, HP-55 HP-65, HP-67, HP-71B, HP-75D, HP-80, HP-92, and HP-97)

5/18/97

Added a picture of a giant HP-33E.

Added another source for battery repairs.

3/15/97

Added more repair information.

3/09/97

• Expanded the description of the HP-97S I/O Calculator.
• Added a section on Planimeters.
• Added a Gunter Rule and a Sector.
• Added several large and complicated slide rules and replaced several slide rule pictures in the Before HP section. Many more slide rules are being scanned for eventual inclusion.

1/05/97

Curta stepped drum operation details added. (More detail in the picture.)

Information on disposable batteries added to the Collector's Corner.

Go back to the main exhibit hall