View source for HP-15C

{{Short description|Programmable scientific calculator produce by Hewlett-Packard}}
{{Use dmy dates|date=April 2019|cs1-dates=y}}
{{Infobox Calculator
| name         = HP-15C
| image        = HP-15C Programmable Scientific Calculator introduced 1982 (edited, built from 2 images).jpg
| caption      = HP-15C
| type         = [[Programmable calculator|Programmable]] [[Scientific calculator|scientific]]
| entry        = [[Calculator input methods#RPN|RPN]]
| introduced   = 1982
| discontinued = 1989
| reintroduced = 2011
| cost         = USD 135 (Original) USD 99.99 – USD 179.99 (15C LE)
| manufacturer = [[Hewlett-Packard]]
| precision    =
| display_type = [[Liquid crystal display|LCD]] [[seven-segment display]]
| display_size = 10 digits
| processor    = [[HP Nut]] core (1LF5 / 1LM2 / 1LQ9<ref name="HP_Voyager_CPUs">{{cite web |url=http://www.brouhaha.com/~eric/hpcalc/voyager/variants.html |title=HP Voyager Calculator Variants |website=Brouhaha.com |access-date=2017-12-10}}</ref>) / [[ARM7TDMI]] core ([[Atmel]] [[Atmel AT91SAM7L128|AT91SAM7L128<!-- -AU -->]]) (15C LE)
| prog_lang    = [[Keystroke programmable]] (fully merged)
| memory_data  = 2…66 registers (R0…R9, R.0/R10…R.9/R20, R21…R65) plus RI, X, Y, Z, T, LAST X
| memory_step  = 0…448 lines
| power        = 0.25&nbsp;mW
| weight       = 113&nbsp;g
| dimensions   = 128&nbsp;× 79&nbsp;× 15&nbsp;mm
}}
The '''HP-15C''' is a high-end scientific [[programmable calculator]] of [[Hewlett-Packard]]'s [[HP Voyager series|Voyager series]] produced between 1982 and 1989.
==Models==
==={{anchor|15C}}HP-15C===
The HP-15C is a high-end scientific [[pocket calculator]] with a root-solver and numerical integration. A member of [[Hewlett-Packard]] [[HP Voyager series|Voyager series]] of [[programmable calculator]]s, it was produced between 1982 and 1989. The calculator is able to handle complex numbers and matrix operations. Although out of production, its popularity has led to high prices on the used market. The HP-15C was a replacement for the [[HP-34C]]. The 15C used [[bulk CMOS]] technology for its processor, resulting in very low power consumption.
==={{anchor|15c+|15CLE|NW250AA}}HP&nbsp;15C Limited Edition===
After showing a prototype labelled ''HP&nbsp;15c+''<!-- f.e. ebay 282358754497 --><ref>{{cite web |url=http://www.hpmuseum.org/forum/thread-7791-post-68608.html#pid68608 |title=HP-15C+ Prototype? |website=Hpmuseum.org |access-date=2017-12-10}}</ref> at the HHC 2010, HP announced the ''HP&nbsp;15C Limited Edition'' (NW250AA) on 1 September 2011. It is based on a flashable controller utilizing the same [[ARM7TDMI]] core already used in the 2008 revision of the [[HP 12C|12C]] but in a different package,<ref>{{cite web |url=http://www.hp.com/hpinfo/newsroom/press/2011/110901xa.html |title=Filter News Results - HP Newsroom HP Press Releases |website=Hp.com |access-date=2017-12-10}}</ref> an [[Atmel]] [[Atmel AT91SAM7L128|AT91SAM7L128]]-AU<ref>{{cite web |url=http://www.finetune.co.jp/~lyuka/interests/calc/hp15cle/ |title=HP 15C Limited Edition |website=Finetune.co.jp |access-date=2017-12-10}}</ref><!-- Atmel AT91SAM7L128-AU was announced to be EOL at 2013-12 with LTS up to 2014-12. --><ref>{{cite web |url=http://media.digikey.com/pdf/PCNs/Atmel/RE133101_AT91SAM7Lxx_Obs.pdf |title=Product End-of-Life (EOL) Notification |website=Media.digikey.com |access-date=2017-12-10}}</ref><ref>{{cite web |url=http://media.digikey.com/pdf/PCNs/Atmel/SE133406A_Obs.pdf |title=Product End-of-Life (EOL) Notification |website=Media.digikey.com |access-date=2017-12-10}}</ref><ref>{{cite web |url=http://media.digikey.com/pdf/PCNs/Atmel/RE150402.pdf |title=Product End-of-Life (EOL) Notification |website=Media.digikey.com |access-date=2017-12-10}}</ref> running an emulator written by [[Cyrille de Brébisson]] to execute the old [[HP Nut]] code much faster than on the original hardware. The calculator was released alongside the [[HP&nbsp;12c 30th Anniversary Edition]]. This model is powered by two [[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.
==={{anchor|15CCE}}HP&nbsp;15C Collector’s Edition===
In May 2023, a HP&nbsp;15C Collector's Edition was announced<ref>{{cite web |title=New: HP 15C Collectors Edition |date=2023-05-02 |author-first=Klaas |author-last=Kuperus |url=https://www.hpmuseum.org/forum/thread-19886.html |access-date=2023-08-10 |url-status=live |archive-url=https://web.archive.org/web/20230809234234/https://www.hpmuseum.org/forum/thread-19886.html |archive-date=2023-08-09}}</ref> and was released in July 2023 by the [[HP Development Company, L.P.]]'s licensees [[Moravia Consulting spol.&nbsp;s&nbsp;r.o.]] and [[Royal Consumer Information Products, Inc.]]<ref name="hpcollectors">{{cite web |title=HP Calculator Division |url=https://hpcalcs.com/product/hp-15c-collectors-edition/ |access-date=2023-07-05}}</ref><ref>{{cite web |title=Eduwinkel |url=https://www.eduwinkel.nl/hp-15c-collectors-edition-calculator.html |access-date=2023-07-05}}</ref> 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;<ref name="HP15C_fw_fixes">{{cite web |url=https://www.hpmuseum.org/forum/thread-19886-post-172018.html#pid172018 |title=The Museum of HP Calculators, post from contributing developer |access-date=2023-08-03}}</ref> it is emulated on the same CPU<ref>{{cite web |url=https://www.hpmuseum.org/forum/thread-19886-post-175417.html#pid175417 |title=The Museum of HP Calculators, vendor's post |access-date=2023-08-03}}</ref> as the 2015 and 2022 variants of the HP-12C, the Microchip ATSAM4LC2CA (ARM Cortex-M4).<ref>{{cite web |url=http://www.brouhaha.com/~eric/hpcalc/voyager/variants.html |title=HP Voyager Calculator Variants |website=Brouhaha.com |access-date=2023-08-03}}</ref> The calculator is also powered by two CR2032 batteries.
The test menu (Off, {{key|g|ENTER|ON}}) officially offers three choices. A fourth choice ({{key|4}}) is [[not manufacturer supported|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:
* CHS stack lift bug (and fix)
* The non-responsive reset procedure documented in the 15C manual had the side effect of rotating the X register by 22 bits which could then be used to perform [[synthetic programming]].<ref>{{cite web |title=HP-15C Synthetics |date=2023-01-30 |orig-date=2004 |author-first=Eric L. "Brouhaha" |author-last=Smith |url=http://www.brouhaha.com/~eric/hpcalc/hp15c/tennant83.html |access-date=2023-09-25 |url-status=live |archive-url=https://web.archive.org/web/20230925194842/http://www.brouhaha.com/~eric/hpcalc/hp15c/tennant83.html |archive-date=2023-09-25}}</ref><ref>{{cite web |title=HP 15C Synthetics and Synthetic Programming |website=[[YouTube]] |date=7 March 2022 |language=en |url=https://www.youtube.com/watch?v=7b6rQtSNnqY |access-date=2022-08-10}}</ref>
HP-15C Limited Edition:<ref>{{cite web |title=HP-15C LE (Limited Edition) Bug Reports |author-first=Katie |author-last=Wasserman |date=2011-12-26 |orig-year=2011-09-16 |url=http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=1089 |access-date=2017-12-20 |url-status=live |archive-url=https://web.archive.org/web/20171220064345/http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=1089 |archive-date=2017-12-20}}</ref>
* 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,<ref>{{citation |title=HP 15C LE PSE / Pause Bug Fix | date=4 July 2022 |url=https://www.youtube.com/watch?v=y5EKQJ62RlU |language=en |access-date=2022-08-05}}</ref> 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.<ref>{{citation |title=HP 15C Limited Edition LE Scientific Calculator Self-tests | date=5 November 2021 |url=https://www.youtube.com/watch?v=QEvuOJTfuaw |language=en |access-date=2022-08-05}}</ref>
HP-15C Collector's Edition:
* 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.<ref name="HP15C_fw_fixes"/> There are a number of bugs and shortcomings in the [[not manufacturer supported|undocumented]] "15.2" and "[[HP-16C|16]]" modes,<ref>https://www.hpmuseum.org/forum/thread-19886-page-16.html<!-- https://web.archive.org/web/20230809235946/https://www.hpmuseum.org/forum/thread-19886-page-16.html --></ref> most of which were fixed by a community member by October 2023.<ref>{{cite web | url=https://www.hpmuseum.org/forum/thread-19886-post-179437.html#pid179437 | title=NEW: HP 15C Collectors Edition }}</ref><ref>{{cite web | url=https://www.hpmuseum.org/forum/thread-19458.html | title=WIP: 16C firmware hack for more memory }}</ref><ref>{{Cite web |title=Modifying firmware to fix the DEC bug - TheCalculatorStore |url=https://www.thecalculatorstore.com/c/hp15c/how-to-use-the-programming-cable/modifying-firmware-to-fix-the-dec-bug |access-date=2024-09-07 |website=www.thecalculatorstore.com}}</ref>
* Pressing and holding a label key after GSB, or pressing and holding A through E in user mode, shows the target step on the original HP-15C but runs the step immediately on the HP-15C CE.<ref>https://www.hpmuseum.org/forum/thread-22535-post-193777.html#pid193777</ref>
=={{anchor|DM15CC|DM15|DM15 Silver Edition|DM15L}}Legacy==
An official PC emulator for the 15C is available as freeware from Hewlett-Packard.<ref>{{cite web |title=Emulateurs |language=fr |date=2014 |url=http://www.calculatrices-hp.com/index.php?page=emulateurs |access-date=2017-09-17 |url-status=dead |archive-url=https://web.archive.org/web/20170917223308/http://www.calculatrices-hp.com/index.php?page=emulateurs |archive-date=2017-09-17}}</ref><ref>{{cite web |title=HP 15C Virtual Calculator |publisher=[[Hewlett-Packard]] |date=2012-11-29 |url=http://www.calculatrices-hp.com/uploads/emulateurs/HP_15C_Virtual_Calculator_2012_11_29.zip |access-date=2017-09-17 |url-status=dead |archive-url=https://web.archive.org/web/20160608225015/http://www.calculatrices-hp.com/uploads/emulateurs/HP_15C_Virtual_Calculator_2012_11_29.zip |archive-date=2016-06-08}}</ref>
There are many [[Software calculator#Simulation of hardware_calculators|calculators simulating software]], imitating various HP calculators.<ref>{{Cite web |title=HP Calculator Simulations |url=https://www.hpmuseum.org/simulate/simulate.htm |access-date=2024-09-06 |website=www.hpmuseum.org}}</ref><ref>{{Cite web |title=OTHER Files |url=https://www.hpcalc.org/other/ |access-date=2024-09-06 |website=www.hpcalc.org}}</ref><ref name=":0">{{Cite web |title=RPN Tutorial |url=https://hansklav.home.xs4all.nl/rpn/ |access-date=2024-09-06 |website=hansklav.home.xs4all.nl}}</ref>
== Gallery ==
<gallery mode="packed" heights="132">
File:Hewlett Packard 15C Standard Edition.jpg|HP-15C from the 1980s
File:HP-15C Calculator Backside (edited, changed perspective to plan).jpg|The rear side of HP-15C
File:HP-15C Collector's Edition.jpg|HP-15C Collector's Editon
</gallery>
==See also==
* [[List of Hewlett-Packard products#Pocket calculators|List of Hewlett-Packard products: Pocket calculators]]
* [[HP calculators]]
==References==
{{reflist}}
==Further reading==
* {{cite book |title=Hewlett-Packard HP-15C Owner's Handbook |publisher=[[Hewlett-Packard Development Company, LP.]] |date=September 2011 |version=2.4 |id=00015-90001 |url=http://www.hp.com/ctg/Manual/c03030589.pdf |access-date=2015-12-05 |url-status=live |archive-url=https://web.archive.org/web/20170917224935/http://www.hp.com/ctg/Manual/c03030589.pdf |archive-date=2017-09-17}}
* {{cite book |title=Hewlett-Packard HP-15C Advanced Functions Handbook |publisher=[[Hewlett-Packard Company]], Corvallis Division |date=August 1982 |id=00015-90011 |url=http://hp15c.org/hp15cAdvanced.pdf |access-date=2015-12-05 |url-status=live |archive-url=https://web.archive.org/web/20170917224950/http://hp15c.org/hp15cAdvanced.pdf |archive-date=2017-09-17}}
* {{cite book |title=Hewlett-Packard HP-15C Advanced Functions Handbook |publisher=[[Hewlett-Packard Development Company, LP.]] |date=2012 |orig-date=1982 |id=00015-90011 |url=http://www.hp.com/ctg/Manual/c03308725.pdf |access-date=2015-12-05 |url-status=live |archive-url=https://web.archive.org/web/20170917224955/http://www.hp.com/ctg/Manual/c03308725.pdf |archive-date=2017-09-17}}
* {{cite book |title=HP 15c Collector's Edition - Scientific Calculator - Owner's Handbook |date=February 2023 |edition=3 |publisher=[[MORAVIA Consulting spol.&nbsp;s&nbsp;r.o.]] |url=https://literature.hpcalc.org/official/hp15c-ce-oh-en.pdf |access-date=2023-08-10 |url-status=live |archive-url=https://web.archive.org/web/20230810093104/https://literature.hpcalc.org/official/hp15c-ce-oh-en.pdf |archive-date=2023-08-10}} (1+xi+293+2+1 pages)
* {{cite book |title=HP 15c Collector's Edition - Scientific Calculator - Advanced Functions Handbook |date=July 2023 |edition=3 |publisher=MORAVIA Consulting spol.&nbsp;s&nbsp;r.o. |url=https://literature.hpcalc.org/official/hp15c-ce-afh-en.pdf |access-date=2023-08-11 |url-status=live |archive-url=https://web.archive.org/web/20230811185846/https://literature.hpcalc.org/official/hp15c-ce-afh-en.pdf |archive-date=2023-08-11}} (2+2+222+2 pages)
* {{cite web |date=March 1982 |author-first=Howard W. |author-last=Markstein |title=A look inside Hewlett-Packard's HP-11C |work=Electronic Packaging and Production Magazine |url=http://www.vcalc.net/hp-11.htm |access-date=2023-08-12 |url-status=live |archive-url=https://web.archive.org/web/20170917225028/http://www.vcalc.net/hp-11.htm |archive-date=2017-09-17}}
* {{cite journal |title=Scientific Pocket Calculator Extends Range of Built-in Functions Matrix operations, complex number functions, integration, and equation solving are only some of the numerous preprogrammed capabilities of HP's latest scientific calculator, the HP-15C. |author-first1=Eric A. |author-last1=Evett |author-first2=Paul J. |author-last2=McClellan |author-first3=Joseph "Joe" P. |author-last3=Tanzini |journal=[[Hewlett-Packard Journal]] |date=May 1983 |volume=34 |number=5 |publisher=[[Hewlett-Packard Company]] |issn=0018-1153 |publication-place=Palo Alto, California, USA |pages=25–35 |url=https://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1983-05.pdf |access-date=2023-09-21 |url-status=live |archive-url=https://web.archive.org/web/20230921192321/https://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1983-05.pdf |archive-date=2023-09-21}} (11 pages)
==External links==
* {{cite web |url=http://www.hpmuseum.org/tech10.htm |title=HP 10C Series Technology and Packaging |work=Museum of HP Calculators |author-first=David G. |author-last=Hicks}}
* {{cite web |url=http://www.brouhaha.com/~eric/hpcalc/ |author-first=Eric |author-last=Smith |title=Hewlett-Packard Calculators}}
* {{cite web |url=http://mycalcdb.free.fr/main.php?l=0&id=815 |website=MyCalcDB |title=HP-15C}}
* {{Flickr image inline link|id=6708144099|name=HP-15 Limited Edition (photo)}}
* {{url|https://www.hpcalc.org/details/9638|HP 15c CE Firmware Update}} (fixing the hidden 16c mod)
{{HP calculators}}
{{Authority control}}
[[Category:HP Voyager series calculators|15C]]