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Comparison of HP graphing calculators
open-in-new
<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Comparison_of_Texas_Instruments_graphing_calculators/cGv73tbG">Comparison of Texas Instruments graphing calculators</a></li> <li><a href="/facts/Casio_graphic_calculators/DyhDuqPd">Casio graphic calculators</a></li> <li><a href="/facts/HP_calculators/4LTUUvHS">HP calculators</a></li> <li><a href="/facts/List_of_Hewlett-Packard_products/BqyAX4uG">List of Hewlett-Packard pocket calculators</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Hewlett-Packard HP 50g scientific calculator". ARM. Archived from the original on 2015-03-09. Retrieved 2015-03-13. <a href="https://archive.today/20150309154238/http://www.arm.com/markets/embedded/hewlett-packard-hp-50g-scientific-calculator.php" target="_blank">https://archive.today/20150309154238/http://www.arm.com/markets/embedded/hewlett-packard-hp-50g-scientific-calculator.php</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>HP 50g / 49g+ / 48gII graphing calculator advanced user’s reference manual (AUR) (2 ed.). Hewlett-Packard. 2009-07-14 [2005]. pp. J-1, J-2. HP F2228-90010. Archived from the original on 2018-09-28. Retrieved 2015-10-10. [1]Searchable PDF <a href="http://www.hpcalc.org/details.php?id=7141" target="_blank">http://www.hpcalc.org/details.php?id=7141</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Prange, James M. (2006-11-02). "Re: Those solid block characters in the characters menu". HP Forum Archive 16. The Museum of HP Calculators (MoHPC). Archived from the original on 2016-08-02. Retrieved 2016-08-02. <a href="http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928" target="_blank">http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Rautenberg, Wolfgang (2004-05-09). "IOMAN - A small but powerful I/O manager for the HP49G/HP49g+". 5.2004. Archived from the original on 2016-08-02. Retrieved 2016-08-02. [2] <a href="/wiki/Wolfgang_Rautenberg" target="_blank">/wiki/Wolfgang_Rautenberg</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Kuperus, Klaas (2015-03-04). "HP 50g: End of an era". forum.hp-prime.de. Moravia. Archived from the original on 2015-04-02. <a href="https://web.archive.org/web/20150402112232/http://forum.hp-prime.de/discussion/787/hp-50g-end-of-an-era" target="_blank">https://web.archive.org/web/20150402112232/http://forum.hp-prime.de/discussion/787/hp-50g-end-of-an-era</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Kuperus, Klaas (2015-03-06). "HP 50g not so good news?". HP Museum. Moravia. Archived from the original on 2018-07-08. Retrieved 2016-01-01. <a href="http://www.hpmuseum.org/forum/thread-3265-post-29694.html#pid29694" target="_blank">http://www.hpmuseum.org/forum/thread-3265-post-29694.html#pid29694</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Wessman, Timothy "Tim" James (2015-12-26). "Windows 10 won't allow HP 50g USB drivers to be installed". HP Museum. Archived from the original on 2018-07-08. Retrieved 2016-01-01. <a href="http://www.hpmuseum.org/forum/thread-5386-post-48114.html#pid48114" target="_blank">http://www.hpmuseum.org/forum/thread-5386-post-48114.html#pid48114</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"Hewlett-Packard HP 50g scientific calculator". ARM. Archived from the original on 2015-03-09. Retrieved 2015-03-13. <a href="https://archive.today/20150309154238/http://www.arm.com/markets/embedded/hewlett-packard-hp-50g-scientific-calculator.php" target="_blank">https://archive.today/20150309154238/http://www.arm.com/markets/embedded/hewlett-packard-hp-50g-scientific-calculator.php</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>HP 50g / 49g+ / 48gII graphing calculator advanced user’s reference manual (AUR) (2 ed.). Hewlett-Packard. 2009-07-14 [2005]. pp. J-1, J-2. HP F2228-90010. Archived from the original on 2018-09-28. Retrieved 2015-10-10. [1]Searchable PDF <a href="http://www.hpcalc.org/details.php?id=7141" target="_blank">http://www.hpcalc.org/details.php?id=7141</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Prange, James M. (2006-11-02). "Re: Those solid block characters in the characters menu". HP Forum Archive 16. The Museum of HP Calculators (MoHPC). Archived from the original on 2016-08-02. Retrieved 2016-08-02. <a href="http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928" target="_blank">http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>Rautenberg, Wolfgang (2004-05-09). "IOMAN - A small but powerful I/O manager for the HP49G/HP49g+". 5.2004. Archived from the original on 2016-08-02. Retrieved 2016-08-02. [2] <a href="/wiki/Wolfgang_Rautenberg" target="_blank">/wiki/Wolfgang_Rautenberg</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>Kuperus, Klaas (2015-03-04). "HP 50g: End of an era". forum.hp-prime.de. Moravia. Archived from the original on 2015-04-02. <a href="https://web.archive.org/web/20150402112232/http://forum.hp-prime.de/discussion/787/hp-50g-end-of-an-era" target="_blank">https://web.archive.org/web/20150402112232/http://forum.hp-prime.de/discussion/787/hp-50g-end-of-an-era</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>Kuperus, Klaas (2015-03-06). "HP 50g not so good news?". HP Museum. Moravia. Archived from the original on 2018-07-08. Retrieved 2016-01-01. <a href="http://www.hpmuseum.org/forum/thread-3265-post-29694.html#pid29694" target="_blank">http://www.hpmuseum.org/forum/thread-3265-post-29694.html#pid29694</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>Wessman, Timothy "Tim" James (2015-12-26). "Windows 10 won't allow HP 50g USB drivers to be installed". HP Museum. Archived from the original on 2018-07-08. Retrieved 2016-01-01. <a href="http://www.hpmuseum.org/forum/thread-5386-post-48114.html#pid48114" target="_blank">http://www.hpmuseum.org/forum/thread-5386-post-48114.html#pid48114</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>HP 50g / 49g+ / 48gII graphing calculator advanced user’s reference manual (AUR) (2 ed.). Hewlett-Packard. 2009-07-14 [2005]. pp. J-1, J-2. HP F2228-90010. Archived from the original on 2018-09-28. Retrieved 2015-10-10. [1]Searchable PDF <a href="http://www.hpcalc.org/details.php?id=7141" target="_blank">http://www.hpcalc.org/details.php?id=7141</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>Prange, James M. (2006-11-02). "Re: Those solid block characters in the characters menu". HP Forum Archive 16. The Museum of HP Calculators (MoHPC). Archived from the original on 2016-08-02. Retrieved 2016-08-02. <a href="http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928" target="_blank">http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Rautenberg, Wolfgang (2004-05-09). "IOMAN - A small but powerful I/O manager for the HP49G/HP49g+". 5.2004. Archived from the original on 2016-08-02. Retrieved 2016-08-02. [2] <a href="/wiki/Wolfgang_Rautenberg" target="_blank">/wiki/Wolfgang_Rautenberg</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>Prange, James M. (2006-11-02). "Re: Those solid block characters in the characters menu". HP Forum Archive 16. The Museum of HP Calculators (MoHPC). Archived from the original on 2016-08-02. Retrieved 2016-08-02. <a href="http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928" target="_blank">http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>Rautenberg, Wolfgang (2004-05-09). "IOMAN - A small but powerful I/O manager for the HP49G/HP49g+". 5.2004. Archived from the original on 2016-08-02. Retrieved 2016-08-02. [2] <a href="/wiki/Wolfgang_Rautenberg" target="_blank">/wiki/Wolfgang_Rautenberg</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>Prange, James M. (2006-11-02). "Re: Those solid block characters in the characters menu". HP Forum Archive 16. The Museum of HP Calculators (MoHPC). Archived from the original on 2016-08-02. Retrieved 2016-08-02. <a href="http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928" target="_blank">http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv016.cgi?read=101928</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>Rautenberg, Wolfgang (2004-05-09). "IOMAN - A small but powerful I/O manager for the HP49G/HP49g+". 5.2004. Archived from the original on 2016-08-02. Retrieved 2016-08-02. [2] <a href="/wiki/Wolfgang_Rautenberg" target="_blank">/wiki/Wolfgang_Rautenberg</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>Nelson, Richard J. (2010). "Hewlett-Packard Calculator Firsts". Hewlett-Packard Development Company, L.P. Archived from the original on 2010-07-03. <a href="https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html" target="_blank">https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></p></li> <li id="fn:23"><p>HP 82240B Infrared Printer (1 ed.). Corvallis, OR, USA: Hewlett Packard. August 1989. pp. 17–18. HP reorder number 82240-90014. <a href="/wiki/Hewlett_Packard" target="_blank">/wiki/Hewlett_Packard</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></p></li> <li id="fn:24"><p>HP 48G Series – User's Guide (UG) (8th ed.). Hewlett-Packard. December 1994 [1993]. pp. 2–5, 27–16. HP 00048-90126, (00048-90104). Archived from the original on 2016-08-06. Retrieved 2015-09-06. [3] <a href="http://www.hpcalc.org/details.php?id=3937" target="_blank">http://www.hpcalc.org/details.php?id=3937</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></p></li> <li id="fn:25"><p>"Thimet Hewlett Packard HP 48S, SX, G, G+, GX, gII". Archived from the original on 2018-10-23. Retrieved 2014-01-20. <a href="https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm" target="_blank">https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>Nelson, Richard J. (2010). "Hewlett-Packard Calculator Firsts". Hewlett-Packard Development Company, L.P. Archived from the original on 2010-07-03. <a href="https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html" target="_blank">https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>HP 82240B Infrared Printer (1 ed.). Corvallis, OR, USA: Hewlett Packard. August 1989. pp. 17–18. HP reorder number 82240-90014. <a href="/wiki/Hewlett_Packard" target="_blank">/wiki/Hewlett_Packard</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></p></li> <li id="fn:28"><p>HP 48G Series – User's Guide (UG) (8th ed.). Hewlett-Packard. December 1994 [1993]. pp. 2–5, 27–16. HP 00048-90126, (00048-90104). Archived from the original on 2016-08-06. Retrieved 2015-09-06. [3] <a href="http://www.hpcalc.org/details.php?id=3937" target="_blank">http://www.hpcalc.org/details.php?id=3937</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></p></li> <li id="fn:29"><p>"Thimet Hewlett Packard HP 48S, SX, G, G+, GX, gII". Archived from the original on 2018-10-23. Retrieved 2014-01-20. <a href="https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm" target="_blank">https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></p></li> <li id="fn:30"><p>Nelson, Richard J. (2010). "Hewlett-Packard Calculator Firsts". Hewlett-Packard Development Company, L.P. Archived from the original on 2010-07-03. <a href="https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html" target="_blank">https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></p></li> <li id="fn:31"><p>HP 82240B Infrared Printer (1 ed.). Corvallis, OR, USA: Hewlett Packard. August 1989. pp. 17–18. HP reorder number 82240-90014. <a href="/wiki/Hewlett_Packard" target="_blank">/wiki/Hewlett_Packard</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></p></li> <li id="fn:32"><p>HP 48G Series – User's Guide (UG) (8th ed.). Hewlett-Packard. December 1994 [1993]. pp. 2–5, 27–16. HP 00048-90126, (00048-90104). Archived from the original on 2016-08-06. Retrieved 2015-09-06. [3] <a href="http://www.hpcalc.org/details.php?id=3937" target="_blank">http://www.hpcalc.org/details.php?id=3937</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></p></li> <li id="fn:33"><p>"Thimet Hewlett Packard HP 48S, SX, G, G+, GX, gII". Archived from the original on 2018-10-23. Retrieved 2014-01-20. <a href="https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm" target="_blank">https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm</a> <a href="#fnref:33" class="footnote-back-ref">↩</a></p></li> <li id="fn:34"><p>Nelson, Richard J. (2010). "Hewlett-Packard Calculator Firsts". Hewlett-Packard Development Company, L.P. Archived from the original on 2010-07-03. <a href="https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html" target="_blank">https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html</a> <a href="#fnref:34" class="footnote-back-ref">↩</a></p></li> <li id="fn:35"><p>"Thimet Hewlett Packard HP 48S, SX, G, G+, GX, gII". Archived from the original on 2018-10-23. Retrieved 2014-01-20. <a href="https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm" target="_blank">https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm</a> <a href="#fnref:35" class="footnote-back-ref">↩</a></p></li> <li id="fn:36"><p>Nelson, Richard J. (2010). "Hewlett-Packard Calculator Firsts". Hewlett-Packard Development Company, L.P. Archived from the original on 2010-07-03. <a href="https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html" target="_blank">https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html</a> <a href="#fnref:36" class="footnote-back-ref">↩</a></p></li> <li id="fn:37"><p>"Thimet Hewlett Packard HP 48S, SX, G, G+, GX, gII". Archived from the original on 2018-10-23. Retrieved 2014-01-20. <a href="https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm" target="_blank">https://web.archive.org/web/20181023044605/http://www.thimet.de/CalcCollection/Calculators/HP-48GX/Contents.htm</a> <a href="#fnref:37" class="footnote-back-ref">↩</a></p></li> <li id="fn:38"><p>Croft, Colin (December 2006). hp 39gs and hp 40gs graphing calculators. Mastering the hp 39gs & hp 40gs - A guide for teachers, students and other users of the hp 39gs & hp 40gs (PDF). 1.0 (1st ed.). Hewlett-Packard Development Company, L.P. pp. 26, 221, 333. HP part number F2224-90010. Archived (PDF) from the original on 2016-03-03. Retrieved 2016-08-06. The original hp 38g only had the function INVERSE(…) and the -1 operator was added for convenience sake in the hp 39g, released in 2000. To do this the creators had to borrow one of the existing unused characters, the 3 character, and convert it into the -1 operator. However, they forgot to change it in the CHARS view and this error has never been fixed in any of the successive models! <a href="http://www.hp.com/ctg/Manual/c00829737.pdf" target="_blank">http://www.hp.com/ctg/Manual/c00829737.pdf</a> <a href="#fnref:38" class="footnote-back-ref">↩</a></p></li> <li id="fn:39"><p>Croft, Colin (December 2006). hp 39gs and hp 40gs graphing calculators. Mastering the hp 39gs & hp 40gs - A guide for teachers, students and other users of the hp 39gs & hp 40gs (PDF). 1.0 (1st ed.). Hewlett-Packard Development Company, L.P. pp. 26, 221, 333. HP part number F2224-90010. Archived (PDF) from the original on 2016-03-03. Retrieved 2016-08-06. The original hp 38g only had the function INVERSE(…) and the -1 operator was added for convenience sake in the hp 39g, released in 2000. To do this the creators had to borrow one of the existing unused characters, the 3 character, and convert it into the -1 operator. However, they forgot to change it in the CHARS view and this error has never been fixed in any of the successive models! <a href="http://www.hp.com/ctg/Manual/c00829737.pdf" target="_blank">http://www.hp.com/ctg/Manual/c00829737.pdf</a> <a href="#fnref:39" class="footnote-back-ref">↩</a></p></li> <li id="fn:40"><p>Croft, Colin (December 2006). hp 39gs and hp 40gs graphing calculators. Mastering the hp 39gs & hp 40gs - A guide for teachers, students and other users of the hp 39gs & hp 40gs (PDF). 1.0 (1st ed.). Hewlett-Packard Development Company, L.P. pp. 26, 221, 333. HP part number F2224-90010. Archived (PDF) from the original on 2016-03-03. Retrieved 2016-08-06. The original hp 38g only had the function INVERSE(…) and the -1 operator was added for convenience sake in the hp 39g, released in 2000. To do this the creators had to borrow one of the existing unused characters, the 3 character, and convert it into the -1 operator. However, they forgot to change it in the CHARS view and this error has never been fixed in any of the successive models! <a href="http://www.hp.com/ctg/Manual/c00829737.pdf" target="_blank">http://www.hp.com/ctg/Manual/c00829737.pdf</a> <a href="#fnref:40" class="footnote-back-ref">↩</a></p></li> <li id="fn:41"><p>Croft, Colin (December 2006). hp 39gs and hp 40gs graphing calculators. Mastering the hp 39gs & hp 40gs - A guide for teachers, students and other users of the hp 39gs & hp 40gs (PDF). 1.0 (1st ed.). Hewlett-Packard Development Company, L.P. pp. 26, 221, 333. HP part number F2224-90010. Archived (PDF) from the original on 2016-03-03. Retrieved 2016-08-06. The original hp 38g only had the function INVERSE(…) and the -1 operator was added for convenience sake in the hp 39g, released in 2000. To do this the creators had to borrow one of the existing unused characters, the 3 character, and convert it into the -1 operator. However, they forgot to change it in the CHARS view and this error has never been fixed in any of the successive models! <a href="http://www.hp.com/ctg/Manual/c00829737.pdf" target="_blank">http://www.hp.com/ctg/Manual/c00829737.pdf</a> <a href="#fnref:41" class="footnote-back-ref">↩</a></p></li> <li id="fn:42"><p>Croft, Colin (December 2006). hp 39gs and hp 40gs graphing calculators. Mastering the hp 39gs & hp 40gs - A guide for teachers, students and other users of the hp 39gs & hp 40gs (PDF). 1.0 (1st ed.). Hewlett-Packard Development Company, L.P. pp. 26, 221, 333. HP part number F2224-90010. Archived (PDF) from the original on 2016-03-03. Retrieved 2016-08-06. The original hp 38g only had the function INVERSE(…) and the -1 operator was added for convenience sake in the hp 39g, released in 2000. To do this the creators had to borrow one of the existing unused characters, the 3 character, and convert it into the -1 operator. However, they forgot to change it in the CHARS view and this error has never been fixed in any of the successive models! <a href="http://www.hp.com/ctg/Manual/c00829737.pdf" target="_blank">http://www.hp.com/ctg/Manual/c00829737.pdf</a> <a href="#fnref:42" class="footnote-back-ref">↩</a></p></li> <li id="fn:43"><p>Croft, Colin (December 2006). hp 39gs and hp 40gs graphing calculators. Mastering the hp 39gs & hp 40gs - A guide for teachers, students and other users of the hp 39gs & hp 40gs (PDF). 1.0 (1st ed.). Hewlett-Packard Development Company, L.P. pp. 26, 221, 333. HP part number F2224-90010. Archived (PDF) from the original on 2016-03-03. Retrieved 2016-08-06. The original hp 38g only had the function INVERSE(…) and the -1 operator was added for convenience sake in the hp 39g, released in 2000. To do this the creators had to borrow one of the existing unused characters, the 3 character, and convert it into the -1 operator. However, they forgot to change it in the CHARS view and this error has never been fixed in any of the successive models! <a href="http://www.hp.com/ctg/Manual/c00829737.pdf" target="_blank">http://www.hp.com/ctg/Manual/c00829737.pdf</a> <a href="#fnref:43" class="footnote-back-ref">↩</a></p></li> <li id="fn:44"><p>Croft, Colin (December 2006). hp 39gs and hp 40gs graphing calculators. Mastering the hp 39gs & hp 40gs - A guide for teachers, students and other users of the hp 39gs & hp 40gs (PDF). 1.0 (1st ed.). Hewlett-Packard Development Company, L.P. pp. 26, 221, 333. HP part number F2224-90010. Archived (PDF) from the original on 2016-03-03. Retrieved 2016-08-06. The original hp 38g only had the function INVERSE(…) and the -1 operator was added for convenience sake in the hp 39g, released in 2000. To do this the creators had to borrow one of the existing unused characters, the 3 character, and convert it into the -1 operator. However, they forgot to change it in the CHARS view and this error has never been fixed in any of the successive models! <a href="http://www.hp.com/ctg/Manual/c00829737.pdf" target="_blank">http://www.hp.com/ctg/Manual/c00829737.pdf</a> <a href="#fnref:44" class="footnote-back-ref">↩</a></p></li> <li id="fn:45"><p>Croft, Colin (December 2006). hp 39gs and hp 40gs graphing calculators. Mastering the hp 39gs & hp 40gs - A guide for teachers, students and other users of the hp 39gs & hp 40gs (PDF). 1.0 (1st ed.). Hewlett-Packard Development Company, L.P. pp. 26, 221, 333. HP part number F2224-90010. Archived (PDF) from the original on 2016-03-03. Retrieved 2016-08-06. The original hp 38g only had the function INVERSE(…) and the -1 operator was added for convenience sake in the hp 39g, released in 2000. To do this the creators had to borrow one of the existing unused characters, the 3 character, and convert it into the -1 operator. However, they forgot to change it in the CHARS view and this error has never been fixed in any of the successive models! <a href="http://www.hp.com/ctg/Manual/c00829737.pdf" target="_blank">http://www.hp.com/ctg/Manual/c00829737.pdf</a> <a href="#fnref:45" class="footnote-back-ref">↩</a></p></li> <li id="fn:46"><p>Nelson, Richard J. (2010). "Hewlett-Packard Calculator Firsts". Hewlett-Packard Development Company, L.P. Archived from the original on 2010-07-03. <a href="https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html" target="_blank">https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html</a> <a href="#fnref:46" class="footnote-back-ref">↩</a></p></li> <li id="fn:47"><p>HP 82240A Infrared Printer (PDF) (2 ed.). Corvallis, OR, USA: Hewlett Packard, Portable Computer Division. October 1986. HP reorder number 82240-90001 (82240-90008). Archived (PDF) from the original on 2016-08-06. Retrieved 2016-08-06. <a href="https://members.ziggo.nl/kees.van.der.sanden/downloads/HP82240A_manual.pdf" target="_blank">https://members.ziggo.nl/kees.van.der.sanden/downloads/HP82240A_manual.pdf</a> <a href="#fnref:47" class="footnote-back-ref">↩</a></p></li> <li id="fn:48"><p>Nungester, Rick (1988-08-18). "Infra-Red output converter". Luc Pauwels (published 2006-10-24). Archived from the original on 2016-08-06. Retrieved 2016-08-06. <a href="http://luc.xalasys.com/HP28" target="_blank">http://luc.xalasys.com/HP28</a> <a href="#fnref:48" class="footnote-back-ref">↩</a></p></li> <li id="fn:49"><p>HP-28S Advanced Scientific Calculator Reference Manual (PDF) (4 ed.). Hewlett-Packard. November 1988 [October 1987]. pp. 266–267. HP 00028-90068. Archived (PDF) from the original on 2015-06-08. Retrieved 2015-10-10. <a href="http://www.hp41.net/forum/fileshp41net/hp28sref.pdf" target="_blank">http://www.hp41.net/forum/fileshp41net/hp28sref.pdf</a> <a href="#fnref:49" class="footnote-back-ref">↩</a></p></li> <li id="fn:50"><p>Nelson, Richard J. (2010). "Hewlett-Packard Calculator Firsts". Hewlett-Packard Development Company, L.P. Archived from the original on 2010-07-03. <a href="https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html" target="_blank">https://web.archive.org/web/20100703031935/http://h20331.www2.hp.com/Hpsub/cache/392617-0-0-225-121.html</a> <a href="#fnref:50" class="footnote-back-ref">↩</a></p></li> </ol>