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 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

 Central Processing Unit (CPU) CPU is the brain of any computer system. In a human body all major decisions are taken by the brain and all other parts of the body function as directed by the brain. Similarly, in a computer system, all major calculations, manipulations and comparisons are made by CPU. CPU is also responsible by all other units of the computer system. ALU - Arithmetic and Logic Unit CU - Control Unit Main Memory and Primary Memory Arithmetic/Logic Unit (ALU) All calculations including comparisons are made by the ALU. The data and instructions, stored in the primary memory prior to processing, are transferred to the ALU where processing takes place. Arithmetic operations include addition, subtractions, multiplication and division Logical operations involve comparisons.   Control Unit (CU) Control Unit will control the flow of data. Control Unit is the "boss" and coordinates all of the CPUs activities. Uses programming instructions, it controls the flow of  infor