HP 12c Prestige
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The HP-12C is a
financial Finance is the study and discipline of money, currency and capital assets. It is related to, but not synonymous with economics, the study of production, distribution, and consumption of money, assets, goods and services (the discipline of fina ...
calculator An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics. The first solid-state electronic calculator was created in the early 1960s. Pocket-sized ...
made by
Hewlett-Packard The Hewlett-Packard Company, commonly shortened to Hewlett-Packard ( ) or HP, was an American multinational information technology company headquartered in Palo Alto, California. HP developed and provided a wide variety of hardware components ...
(HP) and its successor HP Inc. as part of the HP Voyager series.


Functionality

The HP-12C is HP's longest and best-selling product, in continual production since its introduction in 1981. Due to its simple operation for key financial calculations, the calculator long ago became the '' de facto'' standard among financial professionals. Its popularity has endured despite a relatively simple but iterative process such as amortizing the interest over the life of a loan, a calculation that modern spreadsheets can complete almost instantly, can take over a minute with the HP-12C. The 1977 October edition of the '' HP Journal'' contains an article by Roy Martin, the inventor of the simple method of operation used in HP financial calculators, which describes, in detail, the mathematics and functionality built by
William Kahan William "Velvel" Morton Kahan (born June 5, 1933) is a Canadian mathematician and computer scientist, who received the Turing Award in 1989 for "''his fundamental contributions to numerical analysis''", was named an ACM Fellow in 1994, and inducte ...
and Roy Martin that is still used today.


Models


HP-12C

There were at least eight hardware revisions of the HP-12C since 1981 (including one special issue). Over its lifespan, the proprietary
CMOS Complementary metal–oxide–semiconductor (CMOS, pronounced "sea-moss", ) is a type of metal–oxide–semiconductor field-effect transistor (MOSFET) fabrication process that uses complementary and symmetrical pairs of p-type and n-type MOSFE ...
HP Nut (originally the 1LF5, then 1LM2) processor's technology has been redesigned to integrate all the circuitry into a single chip (first the 1LQ9, then 1RR2) and to refresh the manufacturing process (as the foundry could no longer manufacture the necessary chips, having moved on to making higher-density chips). However, HP's market research found in the late 1980s that users did not trust results obtained too quickly and so the CPU speed was never improved from the original 884 kHz, but the speed could be increased by a user modification. In the late 1990s, the CPU was changed to a 3 V process ( Agilent 2AF1-0001, later a Marvell 2AF1-0002) and the battery was therefore changed to a single CR2032 cell replacing the three LR44 cells previously used (F1637A). In 2008, HP modified the design to use an Atmel AT91SAM7L128 processor with ARM7TDMI core running a software emulator of the previous Nut processor, written by Cyrille de Brébisson, in order to execute an image of the former Nut-based firmware in it. This has brought advanced possibilities such as flashing new firmware, not previously possible. HP also released a software development kit (SDK), making it possible to make new and custom operating systems. The calculator ran 60-90 times faster on most benchmark operations. This version (F2230A) was colloquially known as the "''HP-12C+''", although HP did not market it as a different product. In contrast to the preceding revision, it supported two parallel CR2032 cells, of which only one was necessary to run the calculator. Based on the same processor, a limited ''HP 12c 30th Anniversary Edition'' (NW258AA) was introduced in 2011. Only 40,000 of this model were made. The internal hardware of the HP-12C changed again in 2015, when the design switched to use an Atmel ATSAM4LC2CA-AU processor with ARM Cortex-M4 core. The calculator's part number and physical appearance didn't change except for a "Rev 2" plate on the bottom side. It continues to use two parallel CR2032 cells. The firmware reports a 2015 build date. Serial numbers starting with "PHA", "9CJ", "7CD", or "3CD" rule out the older model variant. The 2×3-pin flash port now uses the USB protocol instead of a TTL serial protocol; in addition to this, the calculator's circuit board features an unpopulated mount for a Micro-USB connector. The HP-12C is one of only four calculators permissible in the Chartered Financial Analyst exams, the others being its sister, the HP 12c Platinum, and the Texas Instruments BA II Plus and BA II Plus Professional. Often referred to as a tool for "Old-ie Time-ies," critics of the HP-12C claim its early 1980s technology and style are antiquated. Proponents, however, are quick to note that the HP-12C continues to be both the '' de jure'' and '' de facto'' standard of high finance.


HP 12c Platinum / Prestige

The ''HP 12c Platinum'' is similar in appearance and functionality to the 12C, and is designed to mimic the 12C whilst extending its capabilities in various aspects. The calculator was introduced in 2003, is visibly distinguished by its silver-colored upper half as opposed to the gold-colored plate on the original 12c. There are five variants of the HP 12c Platinum (including two special issues). The 12c Platinum has a faster processor (originally a
Sunplus SPLB20D2 The HyperScan is a home video game console from the toy company Mattel. It used radio frequency identification (RFID) along with traditional video game technology. The included game was rated "T" (Teen, not suitable for under age 13) and the re ...
with 6502 core), larger memory (for up to 30 CFj registers and 400 program steps) and more built-in functions. It allows input to be entered in
algebraic mode There are various ways in which calculators interpret keystrokes. These can be categorized into two main types: * On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate resul ...
as well as in 4-level
classical RPN Reverse Polish notation (RPN), also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators ''follow'' their operands, in contrast to Polish notation (PN), in whi ...
. The calculator's particular implementation of RPN exhibits an unusual behaviour of the key different from that of the 12C and other classical RPN calculators. The first HP 12c Platinum version (F2231A) did not have parentheses, which often led to awkward key sequences to solve problems in algebraic mode. Since 2005, newer versions (F2232A) of the HP 12c Platinum have parentheses on the blue-shifted functions of the STO and RCL keys. They also support undo and backspace and provide memory for up to 80 CFj registers. The firmware changes increased the ROM size beyond the capabilities of the original processor, so it was replaced by the
Generalplus GPLB31A The MOS Technology 8502 is an 8-bit microprocessor designed by MOS Technology and used in the Commodore 128 (C128). It is an improved version of the MOS 6510 used in the Commodore 64 (C64). It was manufactured using the HMOS process, allowing it ...
(still with 6502 core), which is also faster. It was manufactured by Kinpo Electronics. In 2006, Hewlett Packard released a limited edition of the 12c Platinum to commemorate the 25th anniversary of the original 12C's introduction. The ''HP 12c Platinum 25th Anniversary Edition'' also has the parentheses feature and features the GPLB31A processor as well. The latest revision of the 12c Platinum was introduced in 2007 (F2231AA). As in the later revisions of the 12C, it features two parallel rather than only one CR2032 cells, but it continues to be based on the GPLB31A processor. In 2008, the ''HP 12c Prestige'' (F2233A) was released. It features a gold-colored plate like the original 12C, but is otherwise like the fourth HP 12c Platinum model (F2231AA).


Bugs and problems

By design, the HP-12C rounds up the number of payments to the next integer, which produces meaningless results when calculating fractional periods. Consequently, solving for ''n'' returns a value that is mathematically incorrect vis-a-vis the standard annuity formula and different from the value returned by other financial calculators, Excel, etc.


Clones

The ''Aurora FN1000'' calculator in clamshell design was closely inspired by the HP-12C in 2003. Capitalizing on the limited availability of the HP 12c Platinum 25th Anniversary Edition, Victor Technology released the ''Victor V12'' in 2007 which was a budget priced clone of the HP 12c Platinum edition. It is also available as ''BrtC FC-12'' in Brazil. The 2010 ''Compucessory CCS28956'' aka ''Compucessory 28956'', a clamshell design, is another clone of the HP 12c Platinum, but with added margin calculation functions (COST, SELL, MGN). It is also available as ''Procalc FN 1200C'' in Brazil. The ''Truly SC123'' in 2015 closely resembles the HP 12c Platinum as well, but in a vertical case layout. In 2012, SwissMicros (aka RPN-Calc) introduced a miniature clone named ''DM-12CC'' approximating the size of an
ID-1 ID-1 or ID1 may refer to:RECN7701159Q8 * ID-1 format, the standard "credit card" size for identification cards defined by ISO/IEC 7810 * A gene ( inhibitor of DNA binding-1) which controls cancer metastasis * Idaho's 1st congressional district ...
credit card (88 mm × 59 mm × 7 mm). It closely emulates the functionality of the original HP-12C by running the original ROM image in an emulator on an
ARM Cortex-M0 The ARM Cortex-M is a group of 32-bit reduced instruction set computer, RISC ARM architecture, ARM processor cores licensed by Arm Holdings. These cores are optimized for low-cost and energy-efficient integrated circuits, which have been embedd ...
-based
NXP NXP Semiconductors N.V. (NXP) is a Dutch semiconductor designer and manufacturer with headquarters in Eindhoven, Netherlands. The company employs approximately 31,000 people in more than 30 countries. NXP reported revenue of $11.06 billion in 2 ...
LPC1114 processor. Newer ''DM12'' models since 2013 feature a better keyboard and more RAM ( LPC1115). A ''DM12 Silver Edition'' in a titanium case is available as well. In February 2016, SwissMicros introduced the DM12L, a version of the calculator about the same size as the original HP-12C. Deviating from the HP original, these calculators feature a dot-matrix display, switchable fonts and clock speeds, and, based on a Silicon Labs CP2102 converter chip, they come with a USB ( Mini-B)https://www.swissmicros.com/manuals/swissmicros_serial_guide_v1.63.pdf serial interface to exchange data with a PC etc. for backup purposes (and possibly to communicate with applications like PC-based HP-12C emulators) or to update the firmware. Powering via USB is not supported.


References


Further reading

* * * * * * *


External links

*
The Calculator That Never Dies

HP 12c, Thirty Five Years and Still Going Strong

HP-12C
an
HP-12c Platinum
on MyCalcDB (database about 1970s and 1980s pocket calculators)

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