With a logical (block) structural diagram, explain functions of elements of computer system. [HSEB 2060, 61, 62]

Diagram from book (pg 77) or

FIG: Logical Structural Block Diagram of a Computer.

Input Unit: (a) Accept the data and instructions from the outside world.

(b) Convert it to a form that the computer can understand.

(c) Supply the converted data to the computer system for further processing.

Arithmetic and Logic Unit: (a) It accepts operands from registers.

(b) It performs arithmetic and logical operations.

(c) It returns results to register or a memory.

Control Unit: (a) It gives command to transfer data from the input device to the memory and to ALU.

(b) It also transfers result from ALU to memory and to output devices.

(c) It stores programs or instructions in memory.

(d) It supplies required data and instructions from the memory to ALU.

Memory Unit: (a) All the given instructions data and the results are stored during processing period.

(b) By using the unique address we can identify the locations of memory.

Output Unit: (a) It is the unit through which all the results are given out by output devices.

(b) The popular output devices are: printers, monitors, sound etc.