The HP-15C is a high-end scientific

programmable calculator Programmable calculators are calculators that can automatically carry out a sequence of operations under control of a stored computer programming, program. Most are Turing complete, and, as such, are theoretically general-purpose computers. Howe ...

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 ...

's Voyager series produced between 1982 and 1989.

Models

HP-15C

The HP-15C is a high-end scientific

pocket 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 d ...

with a root-solver and numerical integration. A member of

Voyager series of

s, it was produced between 1982 and 1989. The calculator is able to handle complex numbers and matrix operations. Although out of production, its popularity has led to high prices on the used market. The HP-15C was a replacement for the

HP-34C The HP-34C continuous memory calculator was an advanced scientific programmable calculator of the HP 30 series. It was produced between 1979 (cost US$150) and 1983 (cost US$100). Features Root-finding and integration Significant to the HP-34 ...

. The 15C used

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 ...

technology for its processor, resulting in very low power consumption. Hewlett Packard 15C Standard Edition

HP 15c Limited Edition

After showing a prototype labelled "''HP 15c+''" at the HHC 2010, HP announced the ''HP 15c Limited Edition'' (NW250AA) on 1 September 2011. It is based on a flashable controller utilizing the same

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core already used in the 2008 revision of the 12C but in a different package, an

Atmel Atmel Corporation was a creator and manufacturer of semiconductors before being subsumed by Microchip Technology in 2016. Atmel was founded in 1984. The company focused on embedded systems built around microcontrollers. Its products included micr ...

AT91SAM7L128-AU running an emulator written by

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to execute the old

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code much faster than on the original hardware. The calculator was released alongside the

HP 12c 30th Anniversary Edition The HP-12C is a financial calculator made by Hewlett-Packard (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 i ...

. This model is powered by two

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batteries, and can easily be differentiated from the original model by the "Limited Edition" script below the company logo as well as the black text on brushed metal back label, as opposed to the white text on black of the original.The power consumption of the processor is greater than that of the original HP-15C, as HP did not use the same technology in any of the future models.

Bugs and problems

HP-15C: *CHS stack lift bug (and fix) *The non-responsive reset procedure documented in the 15C manual had the side effect of rotating the X register by 22 bits which could then be used to perform synthetic programming. HP-15c Limited Edition: * One of the more significant bugs in the released firmware version (dated 2011-04-15 in the self-test) is that PSE only works once in a program and subsequently blanks the display until the program stops or is stopped. Downgrading the firmware resolves the PSE bug, however, other bugs will also be reintroduced. * The original HP-15C self-test keystrokes do not work with the HP-15C LE and can corrupt memory contents. The original manual did not include the new self-test procedure.

Legacy

Emulators

An official PC emulator for the 15C is available as freeware from Hewlett-Packard. Another version is commercially available for Android and iOS devices.

Clones

On 6 February 2012, SwissMicros (previously known as RPN-Calc) introduced a miniature clone named ''DM-15CC'' approximating the size of an

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credit card (88 mm × 59 mm × 7 mm). It closely emulates the functionality of the original HP-15C by running the original ROM image in an emulator on an

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-based

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LPC1114 processor. Newer ''DM15'' models feature a better keyboard and more RAM ( LPC1115). With a modified firmware (M80 and M1B), the additional memory allows for up to 129 or even 230 registers and up to 1603 or 896 programs steps. A ''DM15 Silver Edition'' in a titanium case is available as well in three color variants (metal, brown, blue). Deviating from the original, these calculators feature a dot-matrix display, switchable fonts and clock speeds, and, based on a

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CP2102 converter chip, they come with a

USB Universal Serial Bus (USB) is an industry standard that establishes specifications for cables, connectors and protocols for connection, communication and power supply (interfacing) between computers, peripherals and other computers. A broad v ...

( Mini-B) serial interface to exchange data with a PC etc. for backup purposes and possibly to communicate with applications (like PC-based HP-15C emulators) or to update the firmware. In September 2015, SwissMicros introduced the ''DM15L'', a version of the calculator about the same size as the original HP-15C. It still comes with a USB Mini-B connector. Powering via USB is not supported.

References

External links

* * * {{Authority control 15C