CH 04 : Operating Systems And Computer Architecture

Input/Output Devices

Ways of feeding data into a computer and /or getting it out.

Program Counter

Register which contains the instructions for the next task to be performed.

Data Bus

Instructions are sent to the Processor (through ________) to be decoded.

Processor

________ sends the decoded instructions as control signals using the Control Bus, to other components of the system, so that the instructions can be executed.

Memory Unit

The unit which contains all the data to be processed and its addresses as well.

Buffers

________ are filled from computer memory and emptied to the hardware, allowing the processor to perform other tasks in the meanwhile.

Registers

High speed storage areas within the computer system, which are needed to store and manipulate data.

Interrupt

A(n) ________ is sent when for example, a page is jammed in the printer, or when a software error occurs.

Arithmetic Logic Unit

Register which allows the calculations and logic operations to be performed within the computer.

Von Neumann System

A computer system which can store programs in a memory.

Interrupt

It is a signal sent to the Processor from a device or software, to make the Processor temporarily stop its current operation and service another.

Processor

The unit where data is processed and the necassary logic operations are carried out.

Buffer

It is a temporary memory area.

Interrupts

________ allow computers to multitask.

Operating System(OS)

It is a computer software running in the background when the computer is on, and performs various operations

Buses

The connections which transport data around the system and also maintain data synchronization

Address Bus

Unidirectional Bus carrying signal related to the addresses of the memory contents

Data Bus

Bidirectional Bus responsible for moving the data and contents of the memory around the system

Control Bus

Unidirectional Bus carrying signals related to control and coordination of all activities in the computer

Memory Address Register(MAR)

Address which contains the location of the memory contents

Memory Data Register(MDR)

Register which contains the content from memory

Arithmetic Logic Unit(ALU)

Register which allows the calculations and logic operations to be performed within the computer

Program Counter(PC)

Register which contains the instructions for the next task to be performed

Current Instruction Register(CIR)

Register which contains the instructions for the current task

Memory Unit

It contains all the data to be processed and its addresses as well

Control Unit

It controls the operation of the memory, processor and input/output devices

Input/Output Devices

Ways of feeding data into a computer and/or getting it out