HP-19C/-29C

{{Redir|HP-19C|a series of similarly named calculators|HP-19B}}

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Image:HP-19C.jpg

File:HP29C.jpg

The HP-19C and HP-29C were scientific/engineering pocket calculators made by Hewlett-Packard between 1977 and 1979. They were the most advanced and last models of the "20" family (compare HP-25) and included Continuous Memory (battery-backed CMOS memory) as a standard feature.

The HP-19C included a small thermal printer, one of the very few hand-held scientific calculators to offer such a feature (HP-91, HP-92 and HP-97 were desktop units and later models like the HP-41C only supported external printers). Due to the printer's power requirements, the 19C used a battery pack of four AA-sized NiCd cells, adding to the weight of the calculator and printer mechanism.

All other capabilities were the same in both models – RPN expression logic, 98 program memory locations, statistical functions, and 30 registers.

Users could develop software for the HP-29C/19C, such as a prime number generator.{{cite news | url=https://archive.org/stream/byte-magazine-1980-10/1980_10_BYTE_05-10_Software#page/n55/mode/2up | title=Prime Numbers on the HP-19C | work=BYTE | date=1980-10-01 | accessdate=2015-12-21 | author=Aslan, Wilfred | pages=54–58}} The calculators expanded the HP-25's program capabilities by adding subroutines, increment/decrement looping, relative branching and indirect addressing (via register 0 as index).

HP's internal code name for the 29C was Bonnie, the 19C was correspondingly named Clyde.{{citation needed|date=October 2013}}

The HP-19C and HP-29C were introduced at MSRPs of $345$345 in 1980 ≈ $910 in 2010 (see [http://oregonstate.edu/cla/polisci/faculty-research/sahr/sahr.htm Inflation Conversion Factors for Dollars] {{webarchive|url=https://web.archive.org/web/20071230220607/http://oregonstate.edu/cla/polisci/faculty-research/sahr/sahr.htm |date=2007-12-30 }}) and $195,$195 in 1980 ≈ $510 in 2010 (ibid.) respectively.

{{anchor|29C GD}}A version adapted to support an additional backward-facing display manufactured by Educational Calculator Devices named EduCALC 29C GD existed as well.{{cite web |title=Educalc 29C GD - any information for me? |author-first=M. |author-last=Augustine |date=2014-04-25 |work=The Museum of HP Calculators |url=https://www.hpmuseum.org/forum/thread-1164.html |access-date=2022-07-01 |url-status=live |archive-url=https://web.archive.org/web/20210205021451/https://hpmuseum.org/forum/thread-1164.html |archive-date=2021-02-05}}