HP 39/40 series are

graphing calculator Graphing Calculator may refer to: * Graphing calculators, calculators that are able to display and/or analyze mathematical function graphs * NuCalc, a computer software program able to perform many graphing calculator functions * Grapher, th ...

s from

Hewlett-Packard The Hewlett-Packard Company, commonly shortened to Hewlett-Packard ( ) or HP, was an American multinational information technology company. It was founded by Bill Hewlett and David Packard in 1939 in a one-car garage in Palo Alto, California ...

, the successors of HP 38G. The series consists of six calculators, which all have algebraic entry modes, and can perform numeric analysis together with varying degrees of symbolic calculation. All calculators in this series are aimed at high school level students and are characterized by their ability to download (via cable or infrared) APLETs or E-lessons. These are programs of varying complexity which are generally intended to be used in the classroom to enhance the learning of mathematics by the graphical and/or numerical exploration of concepts.

HP 39g

The HP 39g (F1906A) was released in 2000. Basic characteristics: * CPU: 4

MHz The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base u ...

Yorke (

Saturn Saturn is the sixth planet from the Sun and the second largest in the Solar System, after Jupiter. It is a gas giant, with an average radius of about 9 times that of Earth. It has an eighth the average density of Earth, but is over 95 tim ...

core) * Communication: Proprietary

infrared Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with the waves that are just longer than those ...

, serial

RS-232 In telecommunications, RS-232 or Recommended Standard 232 is a standard introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a ''DTE'' (''data terminal equipment'') such as a compu ...

(

serial port A serial port is a serial communication Interface (computing), interface through which information transfers in or out sequentially one bit at a time. This is in contrast to a parallel port, which communicates multiple bits simultaneously in Pa ...

). * Memory: 256 KB RAM * Screen resolution: 131 × 64

pixel In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a Raster graphics, raster image, or the smallest addressable element in a dot matrix display device. In most digital display devices, p ...

s * Includes a hard cover * Limited symbolic equation functionality.

HP 40g

HP 40g (F1907A) was released in 2000 in parallel with the HP 39g. The HP 40g's operating system is identical to the HP 39g. Differences detected in hardware during start-up trigger the differences in software functionality. The hardware is identical to the HP 49G/ 39G series (complete with rubber keyboard). In contrast to the 39g, it integrates the same

computer algebra system A computer algebra system (CAS) or symbolic algebra system (SAS) is any mathematical software with the ability to manipulate mathematical expressions in a way similar to the traditional manual computations of mathematicians and scientists. The de ...

(CAS) also found in the HP 49G, HP CAS. Unlike its "bigger brothers", the HP 40g has no flags to set/mis-set resulting in a "better behaved" calculator for straightforward math analysis. Additionally the HP 40g does not have infrared connectivity, and is limited to 27 variables. A list-based solver, and other handicaps make this simple-to-use calculator less adapted to higher end use. The HP 40g is not allowed for use in many standardized tests including the ACT. It is allowed on the

SAT The SAT ( ) is a standardized test widely used for college admissions in the United States. Since its debut in 1926, its name and Test score, scoring have changed several times. For much of its history, it was called the Scholastic Aptitude Test ...

as of 2019, however. Basic characteristics: * Identical to HP 39g except: * Communication: No infrared communication, serial

(

). * Software: Includes an equation writer and advanced CAS.

HP 39g+

150px, HP 39g+ The HP 39g+ (F2224A) was released in September 2003. Basic characteristics: * CPU: 75

Samsung Samsung Group (; stylised as SΛMSUNG) is a South Korean Multinational corporation, multinational manufacturing Conglomerate (company), conglomerate headquartered in the Samsung Town office complex in Seoul. The group consists of numerous a ...

S3C2410X ( ARM920T core) * Memory: 256 KB RAM, 1 MB flash * Communication:

USB Universal Serial Bus (USB) is an industry standard, developed by USB Implementers Forum (USB-IF), for digital data transmission and power delivery between many types of electronics. It specifies the architecture, in particular the physical ...

Mini-B port (using the Kermit or

XModem XMODEM is a simple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 MODEM.ASM terminal program. It allowed users to transmit files between their computers when both sides used MODEM. Keith Petersen made a ...

protocols), IrDA (

). * Power: 3 × AAA as main power, CR2032 for memory backup * Screen resolution: 131×64

s * Does not come with a hard cover * Limited symbolic equation functionality. Note: Although an ARM processor is used in this model, the operating system is substantially the same as that of the 39G, with the Saturn chip being emulated on the ARM at a higher speed than was possible for the 39G. The CAS component of the HP 40G's operating system appears to have been totally removed, rather than simply being hidden at start-up.

HP 39gs

The HP 39gs (F2223A) was released in June 2006. Basic characteristics: * CPU: 75

S3C2410A ( ARM920T core) * Memory: 256 KB RAM, 1 MB flash * Communication:

Mini-B port (using the Kermit or

protocols), IrDA (

), 4-pin asynchronous 3.3 V TTL serial port (RS-232 via active converter). * Power: 4×AAA as main power, CR2032 for memory backup * Screen resolution: 131×64

s * Includes a hard cover * Limited symbolic equation functionality. * Flash memory to allow potential future upgrades/bug fixes. Note: Although an ARM processor is used in this model the operating system is substantially the same as that of the 39G, with the Saturn chip being emulated on the ARM at a higher speed than was possible for the 39G.

HP 40gs

The HP 40gs (F2225A) was released in mid-2006. Basic characteristics: * CPU: 75

S3C2410A ( ARM920T core) * Identical to HP 39gs except: * Memory: 256 KB RAM, 2 MB flash. Flash memory is larger to accommodate the CAS software. * Communication: No infrared communication. * Software: Includes an equation writer and advanced CAS.

HP 39gII

The HP 39gII (NW249AA) was released in October 2011. It is built around an 80 MHz

Freescale Freescale Semiconductor, Inc. was an American semiconductor manufacturer. It was created by the divestiture of the Semiconductor Products Sector of Motorola in 2004. Freescale focused their integrated circuit products on the automotive, embedde ...

(formerly SigmaTel) STMP3770 processor with

ARM926EJ-S ARM9 is a group of 32-bit reduced instruction set computer, RISC ARM architecture, ARM processor cores licensed by ARM Holdings for microcontroller use. The ARM9 core family consists of ARM9TDMI, ARM940T, ARM9E-S, ARM966E-S, ARM920T, ARM922T, ...

core and features 256 KB RAM and 128 MB flash memory (of which ca. 240 KB RAM and 80–105 MB flash are available to users). The high-resolution monochrome gray-scale LCD provides 256×128 pixels. Connectivity is provided through a USB-OTG Micro-AB connector. The BCD math libraries internally used by the calculator were rewritten in platform-independent C code run natively rather than System RPL code executed in an emulator. The Pascal-like programming language supported by the calculator is a predecessor of the HP Prime's HP PPL. The calculator is the first to support a 128-level stack and

Unicode Unicode or ''The Unicode Standard'' or TUS is a character encoding standard maintained by the Unicode Consortium designed to support the use of text in all of the world's writing systems that can be digitized. Version 16.0 defines 154,998 Char ...

(

UTF-16 UTF-16 (16-bit Unicode Transformation Format) is a character encoding that supports all 1,112,064 valid code points of Unicode. The encoding is variable-length as code points are encoded with one or two ''code units''. UTF-16 arose from an earli ...

). Two variants with slightly different labeling of the key exist. Development of a "HP 39gII+", an improved variant of the calculator powerful enough to include a CAS, was almost finished when the underlying processor was abandoned by Freescale, causing the project to be abandoned as well. Instead, the calculator concept was revised again and the specs further improved (e.g. color touchscreen, even more powerful processor), which eventually led to the release of the HP Prime in 2013.

HP 39g

HP 40g

HP 39g+

HP 39gs

HP 40gs

HP 39gII

See also

References

External links