EXTERNAL DEVICES


  EXTERNAL DEVICES

·                 Provide a means of exchanging data between the external environment          and the computer.
·       Peripheral device - An external device connected to an I/O module.
·       Three categories:
1)   Human  readable
·       Suitable for communicating with the computer user
Eg : Video display terminals (VDTs), printers
2)   Machine readable
·       Suitable for communicating with equipment
Eg : Magnetic disk and tape systems, sensors and   actuators

3)   Communication

·       Suitable for communicating with remote devices such as a terminal, a machine readable device, or another computer










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