Casio 99 1 calculator can be used in the exam, but it should be noted that the calculator with graphic calculation function is not allowed in the exam, so it is necessary to turn off the graphic calculation function of 99 1 calculator. Casio 95 calculator does not meet the test requirements and should not be used.
Calculator is a machine invented by modern people that can perform numerical operations.
Modern electronic calculator is a hand-held electronic machine that can perform mathematical operations. It has an integrated circuit chip, but its structure is much simpler than that of a computer. Can be said to be the first generation of electronic computers (computers), with weak functions, but more convenient and cheaper. It can be widely used in business transactions and is one of the necessary office supplies.
In addition to displaying the calculation results, there are often overflow instructions, error instructions and so on. The calculator is powered by an AC converter or a battery, which can be charged by an AC converter or a solar converter. In order to save electricity, calculators all use large-scale integrated circuits made by CMOS process.
Product overview
In ancient times, people invented many calculation tools, such as calculators, abacus, slide rule and so on. With the development of society and the progress of science and technology, computing tools have also experienced changes from simple to complex, from low to advanced. After entering the 20th century, people invented calculators. The appearance of calculator has solved many complicated calculation problems. This calculator is very simple to use. Its operation rule is to calculate from left to right. After entering the data, you can get the result in a blink of an eye.
Composition structure
Calculator is generally composed of arithmetic unit, controller, memory, keyboard, display, power supply and some optional peripheral devices and electronic accessories, and is composed of manual or mechanical equipment. The arithmetic unit and controller of low-level calculator realize simple serial operation through digital logic circuit, and its random access memory has only one or two units for accumulation storage. High-end calculator consists of microprocessor and read-only memory, and has many random storage units to store input programs and data.
The keyboard is the input part of the calculator, generally using contact or induction. In order to reduce the size of the calculator, a key often has multiple functions. The display is the output part of the calculator, including LED display or LCD display. Integrated circuit (see complementary metal oxide semiconductor integrated circuit), which is equipped with automatic power-off circuit that runs irregularly. The peripheral equipment that the calculator can choose is a micro printer, a cassette player and a magnetic card player.