The calculator is generally composed of an operator, a controller, a memory, a keyboard, a display, a power supply, and some optional peripherals and electronic accessories, and is composed of manual or machine equipment. The low-end calculator's arithmetic unit and controller are implemented by digital logic circuits for simple serial operations. The random access memory has only one or two units for accumulating storage. The high-end calculator implements various complicated arithmetic programs by microprocessor and read-only memory, and has more random storage units for storing input programs and data. The keyboard is the input component of the calculator and is generally contact or sensing. To reduce the size of the calculator, one button often has multiple functions. The display is the output part of the calculator, such as a light-emitting diode display or a liquid crystal display. In addition to displaying calculation results, there are often overflow indications, error indications, and the like. The calculator power supply uses an AC adapter or battery, and the battery can be recharged with an AC adapter or a solar converter. In order to save power, the calculators use large-scale integrated circuits (see complementary metal-oxide-semiconductor integrated circuits) fabricated in CMOS technology, and are equipped with a timing-non-operating automatic power-off circuit. The peripherals that can be used in the calculator are micro printers, cassette tape recorders, and magnetic card machines.
In a way, the broad meaning of "computer" is inclusive of "electronic calculator." There are also integrated circuits in the electronic calculator, but the calculator is simple in function and cheaper in price, which is good for carrying and stability.
In the past, such as abacus, Napier bones, mathematics books, engineering slides or mechanical adding machines played a supporting role in numerical calculations. The term calculator originally refers to professionals who run mathematical calculations on paper and pencil. Such semi-manual calculations are both cumbersome and error-prone.
Modern calculators are powered by electricity and come in a variety of shapes and sizes, from inexpensive, credit card-sized simple devices to special calculators with print capabilities.
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