2 A computer system consists of two parts: the software and the hardware.
3 The software isthe information in the form of data and program instructions.The hardware components arethe electronic and mechanical parts of the system.
4 In the computer system there are 3 main hardware sections: the CPUthe main memorythe peripherals
5 CPU What is the main function of the CPU? executes program instructionsco-ordinates the activities of all the other units.
6 Main memory What is the function of the main memory? holds the instructions and data which are being processed by the CPU.The internal memory has 2 sections:RAM (Random Access Memory)ROM (Read Only Memory).
7 Peripherals What are peripherals? are the physical units attached to the computer.They include:input devicesoutput devicesstorage devices
8 Input devices What do input devices enable us to do? to present information to the computer.The most common input devices are:the mousethe keyboard
9 Output devices What do output devices allow us to do? to extract the results from the computer; for example, we can see the output:on the monitorin printed form.
10 Storage devices What do storage devices provide? a permanent storage of both data and programs.They include e.g.:floppy diskshard disks
11 What do you use ports for? We can plug into ports a wide range of peripherals - modems, fax machines, optical drives and scanners.