Traditionally the computer is represented in the block diagram (a). The block diagram shows that the computer has four components: memory, input, output and Central processing unit [C.P.U], which consists of au and cu. The central processing unit [C.P.U] contains various register to store data; arithmetic logic unit [ALU] to perform arithmetic and logic operation, counters, instruction decoder etc. central processing unit [C.P.U] reads instruction from memory and perform the specified task. It communicates with I/O device to accept or send data. These devices are known as peripherals. Here, the central processing unit [C.P.U] is primary and central player.
With the advent of integrate circuits [IC], the central processing unit [C.P.U] was build on a single chip known as microprocessor. Therefore, traditional central processing unit [C.P.U] has been replaced by microprocessor as shown in fig (b). A computer with a microprocessor as its central processing unit [C.P.U] is known as microcomputer. Microprocessor processing unit [M.P.U] implies a complete processing unit with necessary control units.
With the advent of integrate circuits [IC], the central processing unit [C.P.U] was build on a single chip known as microprocessor. Therefore, traditional central processing unit [C.P.U] has been replaced by microprocessor as shown in fig (b). A computer with a microprocessor as its central processing unit [C.P.U] is known as microcomputer. Microprocessor processing unit [M.P.U] implies a complete processing unit with necessary control units.
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