CPU is the unit where all processing of data and complex calculations are carried out.
RAM is the temporary memory which loads data required from the secondary storage temporarily to carry out speedy operations as required.
ROM is the permanent memory which stores data for longer periods of time and where data is stored permsnently for system usage .It contains the set of instructions which are displayed when the PC boots up and resides in the bios.
Oct 25th, 2014
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