1931, The computer system consists of four parts (1) (2) 194) An has the input and output device, cun do processing, but, cannot store data of its own [951 The user accesses the mainframe computer via [96] is a set of instructions that tells the computer about the tasks to be performed and how these tasks are to be performed 1971 controls, coordinates and supervises the operations of the computer, 198) unit stores the data, instructions, intermediate results and output, temporarily, during the processing of data 199) ........... are multi-user, multi-programming and high-performance computers: [100] consists of the mechanical parts that make up the computer as a machine. The hardware consists of physical devices of the computer [101) performs arithmetic and logic operations organizes the processing of data and instructions. It acts as a supervisor and controls and coordinates the activity of other units of computer [102] The computer system hardware comprises main components:... [103] The functions of the Central Processing Unit are [104] Is the mastermind of the computer is one of the most important input devices which used to enter data and characters [105]. ALU is [106] are high-speed storage areas within the CPU, but have the least' storage capacity [107]. Characters and symbols are represented as groups that consist of ...... Bits [108] is a very high speed memory placed in between RAM and CPU [109] is volatile. stores data when the computer is on. The information stored in RAM gets erased when the computer is turned off. (110) stores data and instructions during the execution of instructions ..........is a non-volatile primary memory [112] and are the main memory. [113] Data and program instructions are temporarily held in ........... while the processor is using them. [1141 is an optical disk that can only be read and not written on. It has high-storage [115] ... is an example of sequential access device. [116] disks are direct access devices. Are usually fixed inside the computer case or as extemal devices [118] provides basic functionality to the computer, controls computer hardware, and acts as an interface between user and computer hardware [119]. include a set of commands that the user follows to write a program [120] is a set of instructions, written in a language understood by the computer, to perform a specific task [121] An MS window is an example of [122] [123] are programs which users can make use of their practical life such as Microsoft office A is an interconnection of two or more computers that are able to exchange information 10