A Level CS 1.2.1 Systems Software P1

Collection of systems software that manages the computer.

• Preemption

• Memory Management

• Virtual Memory

• Interrupt

• Operating System

The process of organising the flexible use of the computer’s main memory.

• Device Management

• Memory Management

• Virtual Memory

• Scheduling

• Multitasking

Used when sufficient immediate-access store is not available. Uses secondary storage.

• Paging

• ROM

• RAM

• Virtual Machine

• Virtual Memory

User Interface with icons that represent applications and actions

• Natural Language

• Menu Driven

• Command Line

• Graphical User Interface (GUI)

User Interface where commands are typed at a command prompt.

• Natural Language

• Menu Driven

• Command Line

• Graphical User Interface (GUI)

User Interface where instructions can only be chosen from a selection.

• Natural Language

• Menu Driven

• Command Line

• Graphical User Interface (GUI)

User Interface where commands are spoken.

• Natural Language

• Menu Driven

• Command Line

• Graphical User Interface (GUI)

The process of moving pages between RAM and Virtual Memory

• Swapping

• Interrupting

• Stacking

• Changing

High rate of hard disk access when using Virtual Memory heavily

• Paging

• Interrupting

• Swapping

• Disk Thrashing

The organisation of memory into fixed-sized units.