1. The operating system acts as a communicator between the user and the computer hardware.
1.1. what does an operating system do?
1.1.1. An information system is divided into four components
1.1.1.1. -hardware -OS -application programs -users
1.1.1.1.1. system view
1.1.1.1.2. user point of view
1.1.1.2. the hardware supports two types of work
1.1.1.2.1. user mode
1.1.1.2.2. kernel mode
1.2. architecture of a computer system
1.2.1. cluster system they use multiple cpus to carry out the work. Computers in a cluster share storage and connect to each other through a local network.
1.2.1.1. The term cluster1 from the English cluster, which means 'group' or 'cluster', is applied to distributed systems of computer farms linked together normally by a high-speed network and which behave as if they were a single server.
2. execute and solve user problems, having a better performance
2.1. is that program that runs continuously with the computer
2.1.1. The E/S system is an interface that a computer has with the outside and its main objective is to facilitate all E / S operations between the peripherals and the memory or, in turn, the processor registers.
2.1.1.1. The operating system must guarantee the correct execution of the computer system
3. is that program that runs continuously with the computer
3.1. memory
3.1.1. cpu
3.1.2. disk controller
3.1.2.1. discs
3.1.3. usb controller
3.1.3.1. -printer -keyboard -mouse
3.1.4. graphics adapter
3.1.4.1. monitor
3.2. computer organization
3.2.1. NO-VOLATILE -magnetic tapes -Optical disc -magnetic disk -electronic disk VOLATILE -principal memory -cache -records
3.2.2. Volatile storage devices lose data when power is lost or they are turned off. By contrast, non-volatile devices can maintain data regardless of the state of the main power supply.