![]() RAM is small, both in terms of its physical size and in the amount of data it can hold. ![]() ![]() Hence, a backup uninterruptible power system (UPS) is often used with computers. data stored in it is lost when we switch off the computer or if there is a power failure. We can reach into the memory at random & extremely fast but can also be quite expensive. Since access time in RAM is independent of the address to the word that is, each storage location inside the memory is as easy to reach as other location & takes the same amount of time. Frequency of access of the memory by the CPU decreases.Ī RAM constitutes the internal memory of the CPU for storing data, program and program result.Capacity in terms of storage increases. ![]() Internal Memory − cache memory and primary/main memoryĮxternal Memory − magnetic disk / optical disk etc.Ĭharacteristics of Memory Hierarchy are following when we go from top to bottom. The address of these locations varies from 0 to 65535. Each location or cell has a unique address which varies from zero to memory size minus one.įor example if computer has 64k words, then this memory unit has 64 * 1024 = 65536 memory location. The memory is divided into large number of small parts. Computer memory is the storage space in computer where data is to be processed and instructions required for processing are stored. It is used to store data and instruction.
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