By John G. Webster (Editor)
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COMMUNICATION CAPABILITY Some calculators have already had communication capability for many years, using infrared as well as serial cable and other types of cable ports. These have allowed calculators to communicate with other calculators, computers, printers, overhead display devices that allow an image of the calculator screen to be enlarged and projected for a roomful of people, data collection devices, bar code readers, external memory storage, and other peripheral devices. Protocols are standard formats for the exchange of electronic data that allow different types of devices to communicate with each other.
And reciprocals (1/x). Scientific calculators contain a representation for the constant ȏ, and they can convert angles between degrees and radians. Most scientific calculators accept numbers with 10 to 12 digits and exponents ranging from Ϫ99 to 99, although some allow exponents from Ϫ499 to 499. Graphing Calculators Graphing calculators were first developed in the late 1980s as larger liquid-crystal displays (LCDs) became available at lower cost. The pixels in an LCD display can be darkened individually and so can be used to plot function graphs.
CMOS is also highly reliable and has good latch-up and electrostatic discharge (ESD) protection. Memory Random-access memory integrated circuits are made up of capacitors, which represent bits of information. Each bit may be 572 ELECTRONIC CALCULATORS Figure 6. Electronic components are attached to a printed circuit board to form a printed circuit assembly. in one of two possible states, depending on whether the capacitor is holding an electric charge or not. Any bit of information in RAM can be changed easily, but the information is only retained as long as power is supplied to the integrated circuit.
15.Consumer Electronics by John G. Webster (Editor)