A computer is an electronic device capable of manipulating numbers and symbols under the control of a set of instructions known as computer program. They are different stages of computers (generation)
Mainframe Computers work at a high speed, and have a high storage capacity Mini Computers are medium and powerful Computers. Micro Computer are the commonly used as general purpose Computer Data Storage in a Computer
The Input and Output units are used to receive and display Inputs & Solutions Common i/p & o/p devices : Keyboard, mouse, monitor, printer The CPU (Central Processing Unit) Consists of.
The Control Unit Controls all the activities of the Computer. It sends commands and control signals and finds the sequence of instruction to be executed. Memory Unit is the place where all input data and results are stored. Computer memory is also available in the form of Random Access Memory (RAM) ALU Consists of CKTs for arithmetic operations(+,-,*,/) and logical operations (<,>,>=,<=,==,!=)
Connected components of CPU are called peripherals Input devices Output devices Keyboard, Printer, Mouse, Monitor, Joystic, Dot Matrix Printer, Laser printers, LCD
Primary memory RAM (Random Access memory) Secondary memory ROM (Read only memory) Hard disk RAM : It is a temporary storage medium in a computer. The data to be processed by the computer are transferred from a storage devices or a keyboard to RAM results from a executed program are also stored in RAM. The data stored will be erased when the computer is off. ROM (Read only Memory) : This is a non-volatile or data storage medium which stores start up programs (operating systems).
This essentially stores the BIOS (Basic Input Operating System) Note : Basically Computer System components communicate it binaries as (0â€Ÿs & 1â€Ÿs, 0 refers OFF state,1 refer ON state) Languages of different Generation Computer.
All the instructions are in the binary form and are referred to as machine level or low level language (LLL). It is very difficult to read the instructions written in binary Eg : 00110101011101110001, 101100001010101
All the instruction are in the forms of mnemonics. The symbolic instruction language called as Assembly Language. All the symbolic instructions are converted into binaries with the help of translator called Assembles. ASCII (American Standard Code For Information Interchange) is commonly used for translation of source Program into object Source Program Eg : ADD A, B, R, More R,S Assembler Translated by Assemble Object Program 0101 10101010 0100 00001101
These are written in English with symbols and digits. Then are known as High level language (HLL). common high level languages are c,c++, COBOL, BASIC, FORTRAN, PASCAL, etc. For execution the program is translation into binary form by compiler or interpreter. Source program Compiler, Object Prog, Linker, Executable Program Run the
is a programming language or programming environment designed with a specific purpose in mind, such as the development of commercial business software. In the history of computer science, the 4GL followed the 3GL in an upward trend toward higher abstraction and statement power. The 4GL was followed by efforts to define and use a 5GL.