Transcription of Main Structural Component of a Computer System
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Main Structural Component of a Computer System
8086/8088MP INSTRUCTOR: ABDULMUTTALIB A. H. ALDOURI 1 Main Structural Component of a Computer System The main elements associated with a Computer System are as follows: 1. Central Processing Unit (CPU) 2. Main Memory 3. Secondary Storage Devices 4. Input and Output (I/O) Devices 5. Busses The Processor (CPU) The CPU or processor acts as the controller of all actions or services provided by the System . It is the Brain and the Heart of the Computer . The operations of a CPU can be reduced into the following : 1. Fetch the next instruction from memory. 2. Decode the instruction. 3. Execute the instruction. 4. Store the result of the instruction into main memory. 8086/8088MP INSTRUCTOR: ABDULMUTTALIB A. H. ALDOURI 2 In general, the CPU has three main units: (See the figure below) Arithmetic and Logic Unit (ALU): Performs arithmetic and logical operations.
of memory (Memory size = 220 =1048576 bytes = 1 Mbyte). 2. Data Bus : A 16-bit bidirectional lines used for transferring data between the microprocessor and memory or the peripheral devices. 3. Control Bus : It contains lines that select the memory or I/O and cause them to perform a read or write operation. Internal Registers of 8086µP
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