HP 39/40 series are

graphing calculator A graphing calculator (also graphics calculator or graphic display calculator) is a handheld computer that is capable of plotting graphs, solving simultaneous equations, and performing other tasks with variables. Most popular graphing calculat ...

s from

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 ...

, the successors of

HP 38G The HP 38G (F1200A, F1892A) is a programmable graphing calculator by Hewlett-Packard (HP). It was introduced in 1995 with a suggested retail price of US$80. HP credits a committee of eight high school, community college, and university te ...

. 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 A central processing unit (CPU), also called a central processor, main processor or just processor, is the electronic circuitry that executes instructions comprising a computer program. The CPU performs basic arithmetic, logic, controlling, and ...

: 4

MHz The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that one he ...

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 nine and a half times that of Earth. It has only one-eighth the average density of Earth; h ...

core) * Communication: Proprietary

infrared Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around ...

, serial

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

( serial port). * 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 image, or the smallest point in an all points addressable display device. In most digital display devices, pixels are the smal ...

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 The HP 49/50 series are Hewlett-Packard (HP) manufactured graphing calculators. They are the successors of the popular HP 48 series. There are five calculators in the 49/50 series of HP graphing calculators. These calculators have both al ...

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

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

HP 39g+

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

: 75

Samsung The Samsung Group (or simply Samsung) ( ko, 삼성 ) is a South Korean multinational manufacturing conglomerate headquartered in Samsung Town, Seoul, South Korea. It comprises numerous affiliated businesses, most of them united under the ...

S3C2410X (

ARM920T ARM9 is a group of 32-bit RISC ARM processor cores licensed by ARM Holdings for microcontroller use. The ARM9 core family consists of ARM9TDMI, ARM940T, ARM9E-S, ARM966E-S, ARM920T, ARM922T, ARM946E-S, ARM9EJ-S, ARM926EJ-S, ARM968E-S, ARM996H ...

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

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 port (using the Kermit or XModem protocols),

IrDA The Infrared Data Association (IrDA) is an industry-driven interest group that was founded in 1994 by around 50 companies. IrDA provides specifications for a complete set of protocols for wireless infrared communications, and the name "IrDA" also ...

(

). * 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: *

: 75

S3C2410A (

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

Mini-B port (using the Kermit or XModem protocols),

(

), 4-pin asynchronous 3.3V 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: *

: 75

S3C2410A (

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 (formerly SigmaTel)

STMP3770 The SigmaTel STMP3700 is a low power System on Chip made for PMP's (Portable Media Players). The STMP3700 is using a single ARM processor core clocked up to a maximum of 300 MHz The System on Chip was developed in 2007 for use in portable media play ...

processor with

ARM926EJ-S ARM9 is a group of 32-bit RISC ARM processor cores licensed by ARM Holdings for microcontroller use. The ARM9 core family consists of ARM9TDMI, ARM940T, ARM9E-S, ARM966E-S, ARM920T, ARM922T, ARM946E-S, ARM9EJ-S, ARM926EJ-S, ARM968E-S, ARM996H ...

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 RPL is a handheld calculator operating system and application programming language used on Hewlett-Packard's scientific graphing RPN (Reverse Polish Notation) calculators of the HP 28, 48, 49 and 50 series, but it is also usable on non-RPN ca ...

code executed in an emulator. The

Pascal Pascal, Pascal's or PASCAL may refer to: People and fictional characters * Pascal (given name), including a list of people with the name * Pascal (surname), including a list of people and fictional characters with the name ** Blaise Pascal, Fren ...

-like programming language supported by the calculator is a predecessor of the

HP Prime The HP Prime Graphing Calculator is a graphing calculator introduced by Hewlett-Packard in 2013 and currently manufactured by HP Inc. It was designed with features resembling those of smartphones, such as a full-color touchscreen display and the ...

's HP PPL. The calculator is the first to support

Unicode Unicode, formally The Unicode Standard,The formal version reference is is an information technology Technical standard, standard for the consistent character encoding, encoding, representation, and handling of Character (computing), text expre ...

( UTF-16). 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 (f.e. color touchscreen, even more powerful processor), which eventually led to the release of the

in 2013.

HP 39g

HP 40g

HP 39g+

HP 39gs

HP 40gs

HP 39gII

See also

References

External links