this is C.O.A: Input and Output Devices

INPUT DEVICES :-

Keyboard || Mouse || Scanner || CD-Rom || Game Controller

OUTPUT DEVICES :-

Monitor || Printer || Disk Drive || Floppy Drive || CDRW-Rom || Speaker

This is an examples of input and output devices...

Input and output is the communication between an information processing system and the outside world.

Input :- the signal or data received by the system

Output :- the signal or data sent by the system

In computer architecture, the combination of the CPU and main memory is considered the brain of a computer.

Input and output devices can be characterized by

Behavior :- input, output, storage
Partner :- human or machine
Data rate :- bytes/sec, transfer/sec

Input and output System Design :-

What is input design and output design in system design ?????

Input design is input facilities the entry of data into the computer system. Input design involves the selection of the best strategy for getting data into the computer system at the right time as accurately as possible. This is because the most difficult aspect of input design in accuracy. The use of well-defined document can encourage users to record data accurately without omission.

For example, if the the customer's telephone number is needed input data, the sales order form should have a specific line that is clearly labeled "customer telephone number". Having several lines labeled "customer information" would be less effective.

This is because sometimes only the name and address would be filled in leaving out the telephone number. Input design must capture all the data that the system needs, without introducing any errors. Input errors can be greatly reduced when inputting directly by using appropriate forms for data capture and well designed computer screen layout.