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HP 20b Financial Calculator US$35 Back ordered until Dec 22.

The HP 20b is their entry-level RPN financial calculator. It is aimed primarily at students in real estate, finance, accounting, and business.

It is the best bargain in the financial calculator market, with some advanced features found on no other financial calculators, while being sold at a low price -- the cheapest RPN calculator available.

Note: For international deliveries, I can ship it in an envelope instead of a box, reducing the shipping fee to US$15 (instead of $27+). However, the calculator is not quite as well protected in an envelope. Please email me for details.

Physical Characteristics

• 149 mm by 77 mm by 16 mm (5.87" by 3.03" by 0.63")
• 113 g (4.0 oz) with batteries
• Glossy black faceplate with textured gray slides and glossy black back
• Hard plastic keys (no "click" feedback)
• HP part number F2219AA (Data Sheet)

Technical Specifications

• 2 line alphanumeric display (top line with 8 dot matrix characters and 11 indicators, bottom line with 12+3 digits) with adjustable contrast
• Atmel AT91SAM7L128 ARM7 processor (30 MHz)
• 6 KB RAM, 2 KB battery-backed (50 slots for pairs of statistical or cashflow data, plus 10 storage registers, available to the user)
• 128 KB Flash ROM
• Two CR2032 batteries, providing 9 months of typical use
• 12 digits displayed with 3-digit exponent
• Prompts in English, Spanish, French, and German

Calculating Environments

• Traditional RPN (Reverse Polish Notation) with four-level stack
• AOS-style algebraic, with 12 pending operations
• Chain algebraic, like the 10bII

Communications

• None supported by HP
• Serial port header behind battery door and JTAG connector (connects to AT91SAM-ICE) inside the calculator for developers
• 10-pin and 8-pin footprints accessible inside calculator for 8 digital IO and 4 ADC channels

Programmability

• None built-in
• Externally programmable by developers via JTAG interface

Financial Capabilities

• Time value of money
• Amortization
• Break-even analysis
• Cash flow analysis
• Internal rate of return
• Net present value
• Net uniform series
• Net future value
• Bond calculations
• Depreciation
• Yield and accrued interest
• Interest rate conversions

Probability and Statistics

• List-based, one- and two-variable statistics and forecasting
• Σx, Σx2, Σy, Σy2, Σxy, average, standard deviation, population deviation, standard error
• Linear, logarithmic, base e exponential, base a exponential, inverse, and power regression
• Correlations and covariance
• Combinations, permutations, factorials (gamma function), random number generation
• Lower-tail normal distribution, Student's t distribution, Chi-square distribution, F distribution, and their inverses

Mathematics

• Standard operations (+, -, X, ÷, %, 1/x, +/-, square root)
• Advanced operations (scientific notation, common log, natural log, power, exponential)
• Rounding
• Trigonometry (arc/sine, arc/cosine, arc/tangent, hyperbolics, pi)
• Probability (LTSD, inverse LTSD)
• Absolute value
• Rounding

Standard Exam Support

• AP Physics
• SAT Reasoning Test
• SAT Subject Tests in Mathematics Level 1 and Level 2
• PSAT/NMSQT
• ACT Mathematics Test
• PLAN
• EXPLORE

HP Provided Documentation

• Financial Calculator Quick-Start Guide, 96 sub-A6 pages, provided in printed form with the calculator
• Financial Calculator Manual, 75 A4 pages, provided as a separate download
• Thirty Training Modules, totaling 146 pages, provided as a separate download
• Development Kit, explaining the technical architecture for developing on the 20b platform, provided as a separate download
• HP Euro Font, useful for creating your own documentation

Warranty and Support

• 1 year limited warranty in the US, provided by HP America
• Toll-free technical support in the US, at 800-HP-INVENT (800-474-6836)

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