INTRODUCTION OF COMPUTER

INDEX….. BLOCK DIAGRAM OF COMPUTER COMPONENTS OF COMPUTER HARDWARE-I/0 HARDWARE MEMORY C.P.U

A Computer is A programmable machine. It can execute or run a pre-recorded list of instructions which follow certain rules (a program). Modern computers are electronic and digital. The actual machinery wires, transistors , and circuits is called hardware; the instructions and data are called software.

Block diagram of computer BACK

Components of a Computer System Computer hardware provides the physical mechanisms to process, store, and input /output data. Includes CPU, memory, I/O devices Software provides instructions to tell the hardware what tasks to perform. It includes system (eg Windows XP) and application (eg Excel) software Data in the computer may be representing numbers, characters, graphics etc but is always kept in a form that the hardware and software can manipulate. BACK

Hardware – I/O Input Devices collect & translate raw data into form useable by computer. e.g keyboard accepts letters and numbers and converts them to a binary code such as Unicode. Output devices produce results in useable form for user (or another device). e.g. monitor converts binary codes to characters and images, while modem converts digital data to analog form for transmission over telephone lines. BACK

Hardware – I/O Peripherals 1Input Devices Mouse Keyboard 2 Output Devices Monitor (VDU) Printer BACK

Hardware - memory Memory - Purpose of memory is data storage. Two major types of memory : Primary memory - to hold data and instructions during processing eg RAM. Relatively limited capacity and volatile Secondary memory - to provide permanent long term storage eg hard disk. High capacity and non-volatile BACK

Hardware - memory Secondary storage consists of non-volatile high-capacity devices to store programs and data not currently required by CPU. Hard and floppy disks, and tapes store data as magnetized spots. CD’s and DVD’s store data as pits or surface marks detectable by laser light.

Hardware- memory Digital computers deal with data in binary form - all data is represented using just two digits - 1 or 0. Letters and other symbols are assigned unique binary codes. Primary memory consists of a set of locations defined by sequentially numbered addresses. Each location contains a binary number that can be interpreted as data or an instruction. BACK

Main Memory (RAM) Different from disk storage used to temporarily store Data in modern computers memory is 512 MB.

Central Processing Unit ( CPU) 1.Acting as the brain of the computer’ 2.Currently the Intel-Pentium microprocessor is the most common CPU though there are many types BACK

Hardware- the CPU CPU performs actual processing of data, according to instructions from programs. Data and programs are stored in primary and secondary memory, and moved to and from CPU as required. Signals representing data and instructions travel between system components along electronic pathways, called buses. Capacity of bus is critical to system performance.

Hardware - The Processor The CPU is a general purpose processor that performs data manipulation and/or transformation functions including computations, comparisons and data movement. The CPU consists of 3 main parts: ALU - where arithmetic and logical operations performed Control Unit - controls data movement and execution of instructions Registers - small high speed storage areas BACK

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