Unformatted text preview: mory of a
computer is designed to accept. This transformation is accomplished by units called input
interfaces. Input interfaces are designed to match the unique physical or electrical
characteristics of input devices to the requirements of the computer system.
In short, the following functions are performed by an input unit:
1. It accepts (or reads) the list of instructions and data from the outside world.
2. It converts these instructions and data in computer acceptable form.
3. It supplies the converted instructions and data to the computer system for further
The job of an output unit is just the reverse of that of an input unit. It supplies the
information obtained as a result of data processing to the outside world. Thus it links the
computer with the external environment. As computers work with binary code, the results
produced are also in the binary form. Hence, before supplying the results to the outside
world, it must be converted to human acceptable (readable) form. This task is
accomplished by units called output interfaces. Output interfaces are designed to match
the unique physical or electrical characteristics of output devices (terminals, printers, etc.)
to the requirements of the external environment.
In short, the following functions are performed by an output unit:
1. It accepts the results produced by the computer, which are in coded form and hence
cannot be easily understood by us.
2. It converts these coded results to human acceptable (readable) form.
3. It supplies the converted results to the outside world.
The data and instructions that are entered into the computer system through input units
have to be stored inside the computer before the actual processing starts. Similarly, the
results produced by the computer after processing must also be kept somewhere inside
the computer system before being passed on to the output units. Moreover, the
intermediate results produced by the computer must also be preserved for ongoing
processing. The storage unit of a computer system is designed to cater to all these needs.
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This document was uploaded on 04/07/2014.
- Spring '14