HP 20b

The HP 20b Business Consultant (F2219A, codenamed "Little Euro"[6]) is a financial calculator published in 2008 by Hewlett-Packard. Its function is similar to HP 10bII and includes scientific and statistical functions.

HP 20b
HP 20b
TypeFinancial
ManufacturerHewlett-Packard
Introduced2008
Discontinued2014[1][2][3][4][5]
Latest firmware2010-04-05
SuccessorHP 30b
CostUSD 15 - 40
Calculator
Entry modeRPN, Algebraic, Chain
Display typeLCD seven-segment display dot-matrix display
Display size12+3 digits and 8 characters
CPU
Processor30 MHz Atmel AT91SAM7L128 (ARM7TDMI core)
Programming
Memory register50 pairs of statistical data + 10 registers
Other
Power supply2× CR 2032 batteries (1 required, 1 optional)
Power consumption0.25 mW
Weight113.2 g
Dimensions14.92 × 7.70 × 1.6 cm

Hardware specification

The HP 20b uses a 2 lines display with the first line an 8 character scrolling display and 11 indicators and the second line for 12+3 digit display. It also uses 2 CR2032 batteries, an Atmel AT91SAM7L128 30 MHz processor. The processor's serial interface is accessible from under the battery cover to allow the firmware to be updated using a special cable from HP.

Functions

The HP 20b contains functions similar to the HP 10bII, with financial functions including: TVM, IRR, NPV, NUS ("Net Uniform Series"[7]), amortization, depreciation, bonds, yield and accrued interest, interest conversion, list-based cashflow analysis, cashflows, break-even analysis.

Math/Statistics functions include: list-base, 1 and 2 variable statistics, mean, standard deviation, population deviation, standard error, forecasting, correlations and covariance, +, -, ×, ÷, %, 1/x, +/-, scientific notation, n!, combinations, permutations, rounding, random numbers, LOG, LN, 10×, PL, square root, trigonometry, probability.[8]

For input modes, it supports RPN, Chain and Algebraic input.

It also included several added features include: date calculation, display format and language preferences, memory functions, editing, scroll keys.

Criticism

Many users claim that they dislike the model because it lacks the feedback when pressing the keys, and the menus make things complicated.[9]

Examination approval

The HP 20b is approved by the Hong Kong Examinations and Assessment Authority and can be used in Hong Kong Certificate of Education Examination of 2009 or later.[10]

The HP 20b is approved by the Global Association of Risk Professionals (GARP) and can be used for the Financial Risk Manager (FRM) certification exam.[11]

HP 20b with overlay for WP 34s

Repurposing

Along with the HP 30b, the HP 20b calculator is particularly conducive to repurposing, since both the hardware and software are made public by HP. Several projects have been started around reusing this calculator for other purposes. The most advanced is the WP 34S, a programmable scientific calculator that combines the functionality of the HP-42S and HP-16C and includes many other novel features and functions.[12][13][14][15][16] A firmware branch with a complex number lock mode is called WP 34C.[17] The WP 31S is a stripped-down non-programmable version of the WP 34S, designed to be easier to use.

gollark: You have to deal with trusting a server and maybe key distribution and stuff.
gollark: Fair, although they're somewhat more *complex* than "magic uninterceptable channel"l.
gollark: So only stuff like PotatOS ship strong crypto nowadays.
gollark: The other way would be some sort of hypercomplex crypto solution, but it would probably have its own problems and I think SquidDev said no to including that sort of thing in core CraftOS.
gollark: If they made it magically uninterceptable, that would be uncool and bad for learning.

See also
  • TI BA II Plus
  • TI BA II Plus Professional

References
  1. "HP Solve : Calculating solutions powered by HP" (PDF). H20331.www2.hp.com. April 2013. Retrieved 2019-08-07.
  2. "Product End-of-Life (EOL) Notification : EOL Number: RE133101" (PDF). Media.digikey.com. 2013-08-13. Retrieved 2019-08-07.
  3. "Based on Atmel Management decision, Atmel is retracting the release or EOL RE133101. Atmel is conducting additional review of the discontinuance notice and will reissue notice upon completion of the review" (PDF). Media.digikey.com. Retrieved 2019-08-07.
  4. "EOL Number: SE133406A (REVISED 09/05/2013)" (PDF). Media.digikey.com. 2013-08-28. Retrieved 2019-08-07.
  5. "Product End-of-Life (EOL) Notification : EOL Number: RE150402" (PDF). Media.digikey.com. 2015-01-27. Retrieved 2019-08-07.
  6. "HP 30b codename(s)?". Hpmuseum.org. Archived from the original on 2018-09-19. Retrieved 2019-08-07.
  7. "HP 20b Net Present Value and other Discounted Cash Flow Measures" (PDF). H20331.www2.hp.com. Retrieved 2019-08-07.
  8. "Buy HP Calculators : Educalc.net". Educalc.net.
  9. "Archived copy". Archived from the original on 2011-10-18. Retrieved 2011-10-20.CS1 maint: archived copy as title (link)
  10. "List of Permitted Calculators 2014" (PDF). Hkeea.edu.hk. Retrieved 2019-08-07.
  11. "Exam Policies". Global Association of Risk Professionals | The Only Globally Recognized Membership Association for Risk Managers | GARP.
  12. "34s:repurposing_project [HP Calculator Wiki]". Wiki4hp.com.
  13. Wright, Gene (2011-06-29). "The 20b / 30b has been repurposed into a scientific calculator - The 34S !". HP Communities. Retrieved 2011-08-17.
  14. Dale, Paul; Bonin, Walter (2012) [2008]. "WP 34S Owner's Manual" (PDF) (3.1 ed.). Retrieved 2017-04-27.
  15. Bonin, Walter (2015) [2008-12-09]. WP 34S Owner's Manual (3.3 ed.). CreateSpace Independent Publishing Platform. ISBN 978-1-5078-9107-0.
  16. Bonin, Walter (2016-07-11) [2008-12-09]. WP 34S Owner's Manual (4 ed.). CreateSpace Independent Publishing Platform. ISBN 978-1-53366238-5. ISBN 1-53366238-X. (410 pages)
  17. Dowrick, Nigel (2015-05-03) [2015-03-16]. "Complex Lock mode for WP-34s". HP Museum. Archived from the original on 2019-04-03. Retrieved 2019-08-07.
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