Memory Unit Found on the motherboard Short Term Random Access Memory (RAM) Long Term Read Only Memory (ROM) Random Access Memory (RAM) RAM is a read/write memory. Information can be written into and read from a RAM. It is a volatile memory. It retains the stored information as long as it is supplied with power supply is switched off or interrupted, the stored information in the RAM is lost. RAMs of various capacities are available for example, 256MB, 512MB and so on. Read Only Memory (ROM) Rom is a permanent type memory. Its content are not lost when power supply is switched off. The user cannot write into a ROM. Its contents are written into at manufacturing time. ROMs store permanent programs and other types of data which are needed by the computer to execute user program. Types Of ROM PROM (Programmable ROM) EPROM (Erasable PROM) EEPROM (Electronically Erasable PROM) Cache Memory The data or contents of the main memory that are used frequently by CPU are stored in the cache memory
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