Computer systems and system software

Computer- a programmable device that take in data process it into useful information and then outputs the information so it can be used

General purpose computers one devices that have a variety of uses the user chooses the task for the computer to complete

Embedded systems are more specialised, they can only do a limited number if things but they do them very well

CPU	Central Processing Unit	Brains of the computer It controls everything Large chip inside a computer
RAM	Random Access Memory	Both readable and writable (you can get stuff from it and put stuff into it) Can add, change and delete data stored in RAM It is volatile- when the computer is switched off all of the data stored in RAM is lost It is fast to read/write
ROM	Read-Only Memory	Non-volatile memory- it does not need power to keep the data inside of it It is also fast
Hard drive		Contains multiple hard disks Main storage in your computer Operating system is also stored on the hard drive
BIOS	Basic Input/Output system	Contains all your basic code for controlling your computer hardware When you start up your computer you may see a black screen displaying 'Press F2 for set up'. That is BIOS

Operating systems = Windows, macOS, Linux, Android

Roles of Operating System: