The Apple I was Apple's first product, and to finance its creation, Jobs sold his only means of transportation, a VW van and Wozniak sold his HP-65 calculator for $ 500.

One anecdote describes Thomas Hunt Morgan banning the Friden calculator from his department at Caltech, saying " Well, I am like a guy who is prospecting for gold along the banks of the Sacramento River in 1849.

1984 saw the launch of SideKick, a time organization, notebook, and calculator utility, notable for being a Terminate and Stay Resident ( TSR ) program.

In 2002, a homebrew version for the TI-83 graphing calculator was released.

Later, the Antikythera mechanism, invented some time around 100 AD in ancient Greece, was the first mechanical calculator utilizing gears of various sizes and configuration to perform calculations, which tracked the metonic cycle still used in lunar-to-solar calendars, and which is consistent for calculating the dates of the Olympiads.

* < tt > Cobynsoft's Hash Calculator </ tt >, a free multi-file hash calculator for Windows that calculates MD5, SHA-1, SHA-256 and SHA-512 checksums.

However, in 1975, Texas Instruments, the main supplier of calculator parts, entered the market directly and put out a line of machines priced at less than Commodore's cost for the parts.

Pocket sized devices became available in the 1970s, especially after the invention of the microprocessor developed by Intel for the Japanese calculator company Busicom.

** Flag register-The function for the calculation is stored here until the calculator needs it.

( Again, the line blurs with high-end calculators, which use processor chips associated with computer and embedded systems design, particularly the Z80, MC68000, and ARM architectures, as well as some custom designs specifically made for the calculator market.

The Curta calculator was developed in 1948 and, although costly, became popular for its portability.

There were great efforts to put the logic required for a calculator into fewer and fewer integrated circuits ( chips ) and calculator electronics was one of the leading edges of semiconductor development.

and General Instrument also introduced their first collaboration in ICs, a complete single chip calculator IC for the Monroe Royal Digital III calculator.

The first American-made pocket-sized calculator, the Bowmar 901B ( popularly referred to as The Bowmar Brain ), measuring 5. 2 × 3. 0 × 1. 5 in ( 131 × 77 × 37 mm ), came out in the Autumn of 1971, with four functions and an eight-digit red LED display, for $ 240, while in August 1972 the four-function Sinclair Executive became the first slimline pocket calculator measuring 5. 4 × 2. 2 × 0. 35 in ( 138 × 56 × 9 mm ) and weighing 2. 5 oz ( 70g ).

In 1973, Texas Instruments ( TI ) introduced the SR-10, ( SR signifying slide rule ) an algebraic entry pocket calculator using scientific notation for $ 150.

In 1985, CI launched a calculator for the construction industry called the Construction Master which came preprogrammed with common construction calculations ( such as angles, stairs, roofing math, pitch, rise, run, and feet-inch fraction conversions ).

The Elektronika MK-52 calculator ( using the extended B3-34 command set, and featuring internal EEPROM memory for storing programs and external interface for EEPROM cards and other periphery ) was used in Soviet spacecraft program ( for Soyuz TM-7 flight ) as a backup of the board computer.

A number of respected monthly publications, including the popular science magazine " Наука и жизнь " (" Science and Life "), featured special columns, dedicated to optimization techniques for calculator programmers and updates on undocumented features for hackers, which grew into a whole esoteric science with many branches, known as " yeggogology " (" еггогология ").

The consequences of this were that the pocket calculator was affordable, and that it was now difficult for the manufacturers to make a profit out of calculators, leading to many companies dropping out of the business or closing down altogether.

* A calculator that figures out the dates of Jewish holidays in any year

The Wang LOCI-2 ( an earlier LOCI-1 was not a real product ) was introduced in 1965 and was probably the first desktop calculator capable of computing logarithms, quite an achievement for a machine without any integrated circuits.

However, if one is told that 1931 is part of the answer, one can find the answer by entering " 6895601 ÷ 1931 " into any calculator.

New Desk Accessories were small programs ranging from a calculator to simple word processors that could be used while running any standard desktop application.

Given the observed percentage difference p − q ( 2 % or 0. 02 ) and the standard error of the difference calculated above (. 03 ), any statistical calculator may be used to calculate the probability that a sample from a normal distribution with mean 0. 02 and standard deviation 0. 03 is greater than 0.

Despite the emulation, the 49g + was still much faster than any older model of HP calculator.

However, the libraries included with HPGCC, including routines necessary to actually invoke any HPGCC-compiled program on an actual calculator, are released under a modified GPL license, contrary to GCC on many other platforms which use a more permissive license for their libraries.

* United Kingdom – a graphics calculator is allowed for A-level maths courses ( excluding the C1 module where no calculator of any kind is permitted ), however they are not required and as the exams are designed to be broadly ' calculator neutral '.

Similarly, at GCSE, all current courses include one paper where no calculator of any kind can be used, but students are permitted to use graphical calculators for other papers.

* Turkey – any type of calculator whatsoever is prohibited in all primary and high schools except the IB and American schools.

It is crucial that any examinee check the NCEES website to verify their calculator is acceptable.

In this case, " close enough " is not a stringent criterion at all — to demonstrate this, start with any real number and repeatedly press the cos key on a calculator ( checking first that the calculator is in " radians " mode ).

The most noticeable addition to the new OS was the " Press-To-Test " feature that allowed a teacher to disable any programs installed on the calculator, so they cannot be used on tests, etc.

The calculator had a special user mode where the user could assign any function to any key if the default assignments provided by HP were not suited to a specific application.

Hewlett-Packard even sold a version of the calculator where hardly any keys had function names printed on them, meant for users who would be using the HP-41C for custom calculations only ( thus not needing the standard key layout at all ); this version of the calculator was colloquially known, within HP's Corvallis calculator team, as a " Blanknut " ( because the development code name for the HP-41c's processor was known as the " coconut ").

The TI-80 featured the smallest screen and slowest processor ( 980 kHz proprietary ) of any TI graphing calculator.

For many applications, it is the most convenient way to program any TI calculator, since the capability to write programs in TI-BASIC is built-in.

As this function can also be assigned to any key on the calculator's keyboard, this effectively adds a new function to the calculator.

Today it is regarded as an archaism and replaced by the handheld calculator.

An electronic calculator is a small, portable, often inexpensive electronic device used to perform both basic and complex operations of arithmetic.

** Scanning unit-when a calculator is powered on, it scans the keypad waiting to pick up an electrical signal when a key is pressed.

Sometimes significant design effort is required to fit all the desired functions in the limited memory space available in the calculator chip, with acceptable calculation time.

The fundamental difference between a calculator and computer is that a computer can be programmed in a way that allows the program to take different branches according to intermediate results, while calculators are pre-designed with specific functions such as addition, multiplication, and logarithms built in.

The HP 12c financial calculator is still produced.

According to Mark Bollman, a mathematics and calculator historian and associate professor of mathematics at Albion College, the " Construction Master is the first in a long and profitable line of CI construction calculators " which carried them through the 1980s, 1990s, and to the present.

A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions.

Using the Euclidean algorithm is a simple method that can even be performed without a calculator.

* 1889 – Herman Hollerith is issued US patent # 395, 791 for the ' Art of Applying Statistics ' — his punched card calculator.

A commonly used medium is air, and the National Institute of Standards and Technology has set up an online calculator to convert wavelengths in vacuum to wavelengths in air.

In a similar example, with the phrase " He had a seven-figure income ", the order of magnitude is the number of figures minus one, so it is very easily determined without a calculator to be 6.

This rule is employed by the TI-83 calculator boxplot and " 1-Var Stats " functions.

As of 2011, Hewlett-Packard is producing the calculator models 12C, 12C Platinum, 17BII, 20B ( financial ), 30B ( business ), 33S, 35S, 48GII and 50G ( scientific ) which support RPN.

The Spectrum's chiclet keyboard ( on top of a membrane, similar to calculator keys ) is marked with BASIC keywords, so that, for example, pressing " G " when in programming mode would insert the BASIC command GOTO.

** The first scientific hand-held calculator ( HP-35 ) is introduced ( price $ 395 ).

A computer number format is the internal representation of numeric values in digital computer and calculator hardware and software.

The obelus is also used alone to represent the division operation itself, as for instance as a label on a key of a calculator.

The TI-89 is a graphing calculator developed by Texas Instruments ( TI ) in 1998.