HP-15C

Source: Wikipedia, the free encyclopedia.

HP-15C
Keystroke programmable
(fully merged)
Memory register2…66 registers (R0…R9, R.0/R10…R.9/R20, R21…R65) plus RI, X, Y, Z, T, LAST X
Program steps0…448 lines
Other
Power consumption0.25 mW
Weight113 g
Dimensions128 × 79 × 15 mm

The HP-15C is a high-end scientific

Voyager series
produced between 1982 and 1989.

Models

HP-15C

The HP-15C is a high-end scientific

bulk CMOS
technology for its processor, resulting in very low power consumption.

The Hewlett-Packard 15C from the 1980s
The rear side of a Hewlett-Packard 15C

HP 15C Limited Edition

After showing a prototype labelled HP 15c+

CR2032
batteries, and can easily be differentiated from the original model by the "Limited Edition" script below the company logo as well as the black text on brushed metal back label, as opposed to the white text on black of the original. The power consumption of the processor is greater than that of the original HP-15C, as HP did not use the same technology in any of the future models.

HP 15C Collector’s Edition

In May 2023, a HP 15C Collector's Edition was announced

Royal Consumer Information Products, Inc.[9][10] The calculator is manufactured in the Philippines. It supports up to 672 steps for programs and up to 99 registers. The initial firmware incorporates fixes for the known bugs from previous models (as shown below) and others;[11] it is emulated on the same CPU[12] as the 2015 and 2022 variants of the HP-12C, the Microchip ATSAM4LC2CA (ARM Cortex-M4).[13]
The calculator is also powered by two CR2032 batteries.

The test menu (Off, g+↵ Enter+ON) officially offers three choices. A fourth choice (4) is

undocumented and permits to enter two hidden modes: "15.2" (more memory, but with some limitations like 8×8 inversion matrices and three-digit step number display) and "16" (emulating a HP-16C
).

Bugs and problems

HP-15C:

HP-15C Limited Edition:[16]

  • One of the more significant bugs in the released firmware version (dated 2011-04-15 in the self-test) is that PSE only works once in a program and subsequently blanks the display until the program stops or is stopped. Downgrading the firmware resolves the PSE bug,[17] however, other bugs will also be reintroduced.
  • The original HP-15C self-test keystrokes do not work with the HP-15C LE and can corrupt memory contents. Although a new functional self-test procedure was added, the original manual did not document it.[18]

HP-15C Collector's Edition:

  • No known bugs in the officially supported "15" mode yet; the bugs above and others have been fixed in the firmware, or in the case of the non-functional self-test procedure, instructions to switch to the new self-test are included in the accompanying documentation.
    undocumented "15.2" and "16" modes,[19] most of which were fixed by a community member by October 2023.[20][21]

Legacy

Emulators

An official PC emulator for the 15C is available as freeware from Hewlett-Packard.[22][23] Another version is commercially available for Android[24] and iOS[25] devices.

Clones

The company SwissMicros builds the DM-15C as an HP-15C clone in the size of a credit card (shown), alongside a further model with size and shape close to the original.

On 6 February 2012,

Mini-B)[32] serial interface to exchange data with a PC etc. for backup purposes and possibly to communicate with applications (like PC-based HP-15C emulators)[30]
or to update the firmware. In September 2015, SwissMicros introduced the DM15L, a version of the calculator about the same size as the original HP-15C. It still comes with a USB Mini-B connector. Powering via USB is not supported.

See also

References

  1. ^ "HP Voyager Calculator Variants". Brouhaha.com. Retrieved 2017-12-10.
  2. ^ "HP-15C+ Prototype?". Hpmuseum.org. Retrieved 2017-12-10.
  3. ^ "Filter News Results - HP Newsroom HP Press Releases". Hp.com. Retrieved 2017-12-10.
  4. ^ "HP 15C Limited Edition". Finetune.co.jp. Retrieved 2017-12-10.
  5. ^ "Product End-of-Life (EOL) Notification" (PDF). Media.digikey.com. Retrieved 2017-12-10.
  6. ^ "Product End-of-Life (EOL) Notification" (PDF). Media.digikey.com. Retrieved 2017-12-10.
  7. ^ "Product End-of-Life (EOL) Notification" (PDF). Media.digikey.com. Retrieved 2017-12-10.
  8. ^ Kuperus, Klaas (2023-05-02). "New: HP 15C Collectors Edition". Archived from the original on 2023-08-09. Retrieved 2023-08-10.
  9. ^ "HP Calculator Division". Retrieved 2023-07-05.
  10. ^ "Eduwinkel". Retrieved 2023-07-05.
  11. ^ a b "The Museum of HP Calculators, post from contributing developer". Retrieved 2023-08-03.
  12. ^ "The Museum of HP Calculators, vendor's post". Retrieved 2023-08-03.
  13. ^ "HP Voyager Calculator Variants". Brouhaha.com. Retrieved 2023-08-03.
  14. ^ Smith, Eric L. "Brouhaha" (2023-01-30) [2004]. "HP-15C Synthetics". Archived from the original on 2023-09-25. Retrieved 2023-09-25.
  15. ^ "HP 15C Synthetics and Synthetic Programming". Retrieved 2022-08-10.
  16. ^ Wasserman, Katie (2011-12-26) [2011-09-16]. "HP-15C LE (Limited Edition) Bug Reports". Archived from the original on 2017-12-20. Retrieved 2017-12-20.
  17. ^ HP 15C LE PSE / Pause Bug Fix, retrieved 2022-08-05
  18. ^ HP 15C Limited Edition LE Scientific Calculator Self-tests, retrieved 2022-08-05
  19. ^ https://www.hpmuseum.org/forum/thread-19886-page-16.html
  20. ^ https://www.hpmuseum.org/forum/thread-19886-post-179437.html#pid179437
  21. ^ https://www.hpmuseum.org/forum/thread-19458.html
  22. ^ "Emulateurs" (in French). 2014. Archived from the original on 2017-09-17. Retrieved 2017-09-17.
  23. ^ "HP 15C Virtual Calculator". Hewlett-Packard. 2012-11-29. Archived from the original on 2016-06-08. Retrieved 2017-09-17.
  24. ^ "Hewlett-Packard ships official HP 15c app for Android - Hacker News". news.ycombinator.com. Retrieved 2017-12-10.
  25. ^ "HP reincarnates calculators on iPhone, Windows". Cnet.com. Retrieved 2017-12-10.
  26. ^ "HP Forum Archive 20 Message Index". www.hpmuseum.org.
  27. ^ "Firmware V29 for DM1x/DM41(L) units - www.SwissMicros.com". forum.swissmicros.com.
  28. ^ "DM-15CC Extended Memory". www.hpmuseum.org.
  29. ^ "DM-15". gtello.pagesperso-orange.fr.
  30. ^ a b "HP-15C: DM-15". Hp-15c.homepage.t-online.de. Retrieved 2017-12-10.
  31. ^ "SwissMicros.com". Retrieved 2013-06-29.
  32. ^ a b "HP Forum Archive 21 Message Index". www.hpmuseum.org.

Further reading

External links
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