Multiuser DOS: differenze tra le versioni

Versione delle 01:14, 21 nov 2007

Versione delle 01:26, 21 nov 2007

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'''Multiuser DOS''' è un [[sistema operativo real-time]] per microcomputer [[IBM PC]] e compatibili.

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Dal momento che i terminali costavano molto meno di un PC del tempo, essi offrivano risparmi considerevoli, e facilitavano l'utilizzo di applicazioni multiutente come quelli per il controllo di conti bancari o di azioni in un periodo in cui le reti di computer erano rare, molto costose e difficili da implementare.

<!-- CP/M-86 anded MP/M-86 werefurono laterin seguito mergedfusi toper createcreare Concurrent CP/M (alsonoto knownanche ascome ''CCP/M''), whichche offeredoffriva moreun completelivello di compatibilità più completo con CP/M-86, compatibilityoltre inche le caratteristiche additionmultiutente todi MP/M-86's multiuser capabilities.

AsDal themomento origin ofche MS-DOS wasera asnato acome clone ofdel CP/M, this operatingquest'ultimo systempoteva alsooffrire offereduna limitedlimitata compatibilitycompatibilità withcon MS-DOS - simplele MS-DOSapplicazioni applicationsche whichnon didrichiedevano notl'accesso directlydiretto accessallo theschermo screeno orad otheraltre hardwareperiferiche couldpotevano beessere runseguite undersu CCP/M. ForAd exampleesempio, althoughse aun consoleprogramma programche suchlavorava asin modalità solo testo come [[PKZip]] workedfunzionava perfectlyperfettamente anded offeredoffriva moremaggiori facilitiesfunzionalità than the CP/M-nativedell'archiviatore ''Arc'' archivernativo per CP/M, moreapplicazioni complexpiù applicationscomplesse whichche performedagivano screendirettamente manipulationssullo schermo, such ascome [[WordStar]] forper DOS, would not andrichiedevano thusversioni native CCP/M versionsper werepoter requiredfunzionare.

<!-- CCP/M was developed into Concurrent DOS (AKA ''CDOS''), which offered more complete DOS compatibility. The first released version, CDOS 3.2, was compatible with MS-DOS 1; later versions added compatibility with MS-DOS 2.x and 3.x. Versions 5 and 6 (''Concurrent DOS XM'') could [[bank switching|bank switch]] multiple programs using [[Expanded memory|EEMS]].

In 1987, CDOS was rewritten as Concurrent DOS/386. Because this ran only on machines equipped with the [[Intel]] [[80386]] processor, it could use the 386's [[hardware]] facilities for [[virtualization|virtualising]] the hardware, allowing most DOS applications to run unmodified under CDOS/386 - even on terminals. The OS even supported concurrent multiuser file access, allowing [[computer network|network]]-aware DOS applications to run as if they were on individual PCs attached to a network [[Server (computing)|server]]. Thus CDOS/386 was not only a cheaper alternative to individual PCs but allowed just a single server to support an entire office full of workers, without the expense of individual workstations, network cards and network cabling.

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[[Categoria:Sistemi operativi real-time]]

[[Categoria:Digital Research]]

[[en:Multiuser DOS]]