Memory Unit:
This part of CPU consists of the tiny space CPU-registers.
These registers are used to input intermediated data during processing.
Output unit
The output unit performs work
just the reverse of the input unit. It intakes the information resulted from
the processing unit, and present it to the user in human readable form.
Output devices such as monitor, printer,
speaker etc forms the output unit. The output produced by the monitor is soft
copy output because the output cannot be touched but can be seen. Whereas, the
output produced by printer and plotter is hardcopy output because output because
output comes in a paper form which can be touched.
Storage Unit
The storage unit performs the
task of storing the data and instruction. There are basically two classes of
storage unit. they are primary storage also called primary memory and the
secondary storage also called secondary memory.
Primary Memory
This unit is a temporary storage
in the computer. It holds currently running programs, data and instructions. RAM
( Random Access Memory) ROM (Read Only Memory )are the primary memory of
computer. In many cases primary memory is considered as the part of processing
unit.
Secondary Memory
This class of storage unit
stores the data and instructions permanently that they are easily accessible in
the future. It is also used to record the processed results. Several
secondary storage media such as hard disk, floppy disk, zip disk etc form a
storage unit.
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