An expanded computer system

An expanded computer system:

There are several methods for getting data into the computer, called the input. Getting data out from the computer, called the output. The functional units of an expanded system are:

An expanded computer system

• Input unit: It takes data and instructions as the input and then converts those inputs in machine read-able from.
• Processing Unit: It manipulation the data to make useful information. The basic operation of processing units are- arithmetic’s, logical, shift, controls etc.
• Output Unit: It converts the machine readable results into human read-able from and displays the results in soft copy from or in hardcopy from.
• Storage Unit: The primary memory is used to store the sets of instructions that the computer will follow. Two types of primary memory are-

• RAM
• ROM

Primary memory is volatile (except: ROM). The secondary storage enables the computer to save large volume of data. Such kind of memory is non-volatile. Example: CD, Hard disk etc.