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01




               02                                                        COMPUTER MEMORY














                           Your Aim

                           to learn about:

                                  Memory                      Measuring the Computer’s Memory




            When you were a child, you were taught about alphabet and numbers. Do you still
            remember it? How? This is so because these were stored in your memory. Just like
            human memory, computers also have memory to store all the data and instructions
            for performing various tasks.


                MEMORY

            The data and instructions that are entered into the computer using input devices
            are stored inside the memory. There are two types of memory:  Primary memory
            and Secondary memory.

            Primary Memory

            This is the main memory of the computer. CPU can directly access this memory. It is
            fixed on the motherboard of the computer. Primary memory is further divided into
            two types: Random Access Memory (RAM) and Read Only Memory (ROM).

            Random Access Memory (RAM)

            RAM is a temporary memory. The information stored in this
            memory is lost when the computer is turned OFF. That’s why it
            is also called volatile memory.

                                                                                                        RAM
                                     Read Only Memory (ROM)

                                     Information stored in ROM is  permanent  in nature,  i.e., it
                                     holds the data even if the system is switched OFF. It holds the

                                     starting instructions that are required to start a computer. It is
              ROM
                                     also called non-volatile memory.

                                                                                    Computer Memory          13
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