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Gladys Mba
Mindmap von , erstellt am more than 1 year ago

A level, A2 IT (Chapter 2) Mindmap am 2b Operating Systems, erstellt von Gladys Mba am 12/12/2016.

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Gladys Mba
Erstellt von Gladys Mba vor etwa 8 Jahre
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2b Operating SystemsRolesDeals with security and passwordsResponds to user inputManages computer systemOpens and saves filesAllocates memory to applicationsCommunicates with hardware (using drivers)Prioritises processes.Single UserOnly one user can use the computersystem (processor) at a time.There can be multiple userACCOUNTS but they can't beused simultaneously.e.g. A stand alone computer with nonetwork connectionMulti-userCan be used by more than one user at a timee.g. Can refer to a networked server withmany devices connectede.g Can be a mainframe computerwith many terminalsRolesManage log-ons and permissionsAllocate jobsAllocate memory to each user.Multi-taskingDistributed processingProcesses using several processorsfrom several computers usually indifferent locationsComputers need to benetworked LAN or WANEvery computer has its ownprocessor and memoryOne computer (usually a server)acts as co-ordinating deviceProcessing takes place when otherprocessors are idle from normaltask e.g. at nightServer assigns tasks to other processorsResult gathered by co-ordinating deviceto produce final outpute.g multi-player games or research applicationsCan process more than one task at the same timee.g. word processor being opened while a document is printingFast single processors can usescheduling to seem like their aremulti-taskingSeems like multitaskingProcessors with multiple cores ofsystems with more than oneprocessor can really multi-taskDoppelklick auf diesen KnotenKlicke und ziehe diese Schaltfläche, um einen neuen Knoten zu erstellen