What is OS?
A software acting as an intermediary between the user of a device and the hardware of the device
What resources do a computer system consist of?
Cpu,memory,i/o and storage
What is the OS responsible for?
It is responsible for allocating hardware resources to user processes and controlling their execution.The aim is to avoid failures and errors eg two programs attempting to write at the same memory location.
What is a user process?
Its a program in execution
What must the OS be able to do?
It must be able to load a program into memory.
It must be able to execute a program
It must be able to stop that program