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Components of a Computer System

Lesson 17: Modes Of Use

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Learning ObjectivesLearning Objectives

Define Modes of Use / Operation.Define and understand the differences between

batch processing, on-line processing and realtime processing.

Have an understanding of a wider range of work-related IT applications and their effects.

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There are 2 main types of software

There are 2 main types of softwareSoftware

System Software Applications Software

Human Computer/ User Interfaces

Carries out some task/s for the user allowing the user to produce

something useful.

Carries out some task/s for the user allowing the user to produce

something useful.

Performs tasks needed to just run the computer system. Without system software application

software could not run.

Performs tasks needed to just run the computer system. Without system software application

software could not run.

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System Software

Operating Systems Utilities

Modes Of Use / Operation

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Modes of Use / OperationModes of Use / Operation

The first kinds of operating system could only do one task at a time for one user.

Then other operating systems came out that could work in other ways or modes.

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Modes of Use / OperationModes of Use / Operation

Some books classify modes of use / operation as different types of operating systems.

However, modern operating systems can work in a multitude of different ‘modes’.

So it is best to think of ‘Modes of Use’ as the different ways or modes operating systems can work in.

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Modes of Use / Operation

Batch(& off-line)Processing

Real-timeProcessing

On-lineProcessing

InstructionsClick a mode for

more information.

Click a mode for more information.

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On-line processingOn-line processing

User has direct contact with processor.Used when:

Processor needs to be constantly ready to receive input.

Justified by:Explaining why processor needs to be constantly

ready to receive input.Examples

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Examples of On-line processing

Real Time (Transaction)

Examples of On-line processing

Real Time (Transaction)

Cash withdrawals fromATMsEFTEFTPOS systems

Booking systemsAir ticketHolidayTheatreCinema

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As soon as a transaction is received by the computer, it is processed and any data files are updated.

As soon as a transaction is received by the computer, it is processed and any data files are updated.

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•Any control system which uses sensors requiring immediate response at the time of input, quickly enough to affect the next input.

•Is by definition also on-line.

•Used because a system must react immediately when input from a sensor is received as a delay is unacceptable.

•Justified by:

•Explaining what action must be taken immediately and why a delay is unacceptable.

Real-time processingReal-time processing

Examples

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Examples of Real-time processing

Examples of Real-time processing

Air traffic controlReal-time bankingAny safety critical

systemsGames / simulations.

rockets fired onto space, robots

computer controlled air conditioningcentral heatingburglar alarmgreenhouses etc.

Any control system requiring immediate response or safety critical system.

Any control system requiring immediate response or safety critical system.

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Collect data together before being processed.

Batch processingBatch processing

Off-line processingOff-line processing

User cannot communicate directly with processor.

Used When

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Batch and Offline processing is used when :

Batch and Offline processing is used when :

Batch:Large amounts of data to be processed that will

take a long time to complete.Data processing of similar type.Processor time is available in quiet time.Off-line:No human intervention required. Examples

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Example uses of Batch and Off-line processing

Example uses of Batch and Off-line processing

The processing of:Bank chequesPayroll

Non-automatic stock control systemsUtility billing.

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‘Modes Of Use’‘Modes Of Use’

Students -- ICT -- IGCSE -- Computer System -- 9 Software (Modes of Use).

Follow its instructions.

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PlenaryPlenary

What are Modes of Use / Operation?The different ways or modes an operating system

can work in.

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PlenaryPlenaryWhat is on-line, real-time, batch and off-line processing?

On-line processingUser can communicate directly with processor.

Real-time processingData received is processed quickly enough to effect the next input.

Batch and Off-line processingCollects data together before being processedUser cannot communicate directly with processor

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PlenaryPlenary

When are on-line, real-time, batch and off-line processing used?

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Examples of On-line processing

Examples of On-line processing

Cash withdrawals fromATMsEFTEFTPOS systems

Booking systemsAir ticketHolidayTheatreCinema

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Examples of Real-time processing

Examples of Real-time processing

Air traffic controlReal-time bankingAny safety critical

systemsGames / simulations.

rockets fired onto space, robots

computer controlled air conditioningcentral heatingburglar alarmgreenhouses etc.

Any control system requiring immediate response or safety critical system.

Any control system requiring immediate response or safety critical system.

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Example uses of Batch and Off-line processing

Example uses of Batch and Off-line processing

The processing of:Bank chequesPayroll

Non-automatic stock control systemsUtility billing.

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