Calculator

Calculator Components

If you've read the previous page, you'll be aware by now that handheld calculatorsneed microprocessors with a single chip to work. How do you turn on the microprocessor? It all starts with what's in the exterior of the device.

Many modern calculators come with a tough plastic casing, with small holes in the front to allow rubber to pass through, much like a remote for television. With a single touch, you'll complete a circuit below the rubber, which sends electrical impulses to a circuit board beneath. These impulses travel through the microprocessor, which interprets the data and provides an output to the calculator's display screen.

Displays on early electronic calculators were comprised of LEDs, or light emitting diodes. The latest models that require less power are equipped with the LCD, or liquid crystal display, or LCD. Rather than producing light, LCDs rearrange light molecules to create a pattern in the display. They do not require as much power.

The first calculators also had to be plugged in or used bulky batteries. In the late in the 70s solar cell technology was becoming affordable and reliable enough to be used in consumer electronics. The solar cell generates electricity when photons from sun's rays are absorption by semiconductors, like silicon, in the cell. These electrons get sucked out, and the electric field inside the solar cell ensures that they are all traveling in the same direction, and thus creates electrical current. (Something like an LCD calculator requires only an extremely low level of current, which is why their solar cells are tiny.) In the early 1980s, many producers of basic calculators were taking advantage of technologies based on solar cells. These more powerful graphing and scientific calculators but, in reality, use batteries.

In the following section, we'll look more closely on binary code as well as how the calculator actually performs its job.Hello, Beghilos!

You might have utilized the pocket calculator at some point to spell words upside-down, like 07734 ("hELLO"). But did you know that this language actually has a name? It's known as "BEGhILOS," after the most frequent letters you can make using a simple calculator display.

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How a Calculator Calculates

As you've learned from previous pages, most calculatorsdepend upon integrated circuits generally referred to as chips. These circuits make use of transistors for subtracting and adding, in addition to performing computations using logarithms to carry out division, multiplication as well as more complicated tasks such as using exponents , and getting square roots. Basically, the more transistors an integrated circuit is equipped with, the more advanced the capabilities it has. A majority of standard pocket calculators have identical, or very similar circuitry.

Like every electronic device, the processors inside the calculatorwork by reducing any information you give it to its binary equivalent. Binary numbers translate our numbers to the base-two method, in which we signify each digit by a 1 or a 0, doubling every time we move an digit. If we are "turning on" each of the locations -- in other words, by putting a 1 in it -this means that the digit is included in our overall number.

Microchips implement binary logic by switching transistors into and out of operation, literally, with electricity. Thus, for instance in the case of add 2 + 2 the calculator will make each "2" to binary (which appears like this: 10) and then add them all up. The addition of to the "ones" column (the two zeros) and you get zero: The processor can recognize that there's nothing in the initial position. When it adds the digits to the "tens" column, the chip has 1+1. It notices that both are positive and -as there aren't 2's in binary , itis able to move the positive reply one digit to the left, giving a total of 100 -which is binary in terms and equals 4. [Source: Wright].

The sum of this is passed through the input/output chips in our circuit that is able to apply the same logic to the display itself. Have you ever thought about the way that numbers on an alarm clock or calculator or alarm clock are made up of segmented lines? Each one of those parts of the numerals is turned on or off using this identical binary logic. So, the processor can take the number "100" and translates it by lighting up or turning on certain parts of the displays to produce the number 4.

On the next page, we'll look at the impact the calculator's influence has on the world and how we can expect to see them grow within the future.The Difference Engine

An engineer working in the Hessian army devised the predecessor to today's computer in 1786. The concept was for printing mathematical tables by computing the difference between the various equations. Because it worked in a sequential and automatic manner and continuously, these "difference engines" are considered important precursors of the modern computer. A Swedish family of fathers and children team, the Scheutzes developed a working difference engine in 1853 . It is on display in the Smithsonian Institute.