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    Magnetic Ink Character Reader (MICR)

                      Magnetic Ink Character Reader is an input device that reads
                      special characters that are printed using special magnetic ink on
                      cheques like cheque number, bank code and branch code. MICRs
                      scan this information and are thus capable of sorting cheques.

                                             PROCESSING DEVICE

                                             The Central Processing Unit is the processing device of a computer.
                                             It is also known as  the  brain of the  computer. It performs all the
                                             calculations and processes data into information. It receives input

                                             from input devices, processes them and sends the processed result
                                             to the output unit. A CPU consists of three units.

                         Arithmetic Logic Unit: The Arithmetic Logic Unit or ALU performs arithmetic, comparison
                        and logical operations.

                         Control Unit: The Control Unit or CU controls all the functions of a computer. It also
                        checks the result given by ALU.

                         Memory Unit: The Memory Unit or MU holds the data that needs to be processed as
                        well as the data that has been processed by the CPU.

                      OUTPUT DEVICES

                      We have already learnt about  some  basic  output  devices  like  monitors,  printers, etc.
                      Let us now learn more about these devices.

                      Printer
                      Printer is an output device that gives the output on paper. The result printed on paper is

                      called a hardcopy or printout. Printers can be classified into two categories: impact and
                      non-impact.

                      Printers that have direct contact between the print head and paper are known as impact
                      printers. The printers that do not have direct contact between the print head and paper
                      are known as non-impact printers.

                      Laser Printer

                      This is a non-impact printer that uses laser technology to print
                      text or images on paper. It is expensive and gives the best quality
                      output. The speed of the laser printer is measured in pages per

                      minute (ppm).

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