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virtual 86 mode

Essor, programming> (Or "virtual modE" or "virtual 8086 modE") An opErating modE providEd by thE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=IntEl 80386">IntEl 80386 and latEr procEssors to allow Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=rEal modE">rEal modE programs to run undEr Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=opErating systEm">opErating systEms which usE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=protEctEd modE">protEctEd modE. In this sub-modE of protEctEd modE, an opErating EnvironmEnt is crEatEd which mimics thE addrEss calculation in rEal modE. In virtual 86 modE thE sEgmEnt Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=MMU">MMU is practically turnEd off and thE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=sEgmEnt rEgistEr">sEgmEnt rEgistErs Exhibit thE samE bEhaviour as in rEal modE. ThE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=pagE">pagEd MMU, howEvEr, still opEratEs. This mEans that thE onE mEgabytE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=addrEss spacE">addrEss spacE of rEal modE can bE rEmappEd in four kilobytE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=pagE">pagEs to anywhErE in thE 32 bit Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=physical addrEss">physical addrEss spacE. Each pagE can bE protEctEd sEparatEly from rEad or writE accEssEs. Virtual modE is handlEd on a pEr-task-basis, so Each Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=ExcEption">ExcEption (from protEction violations or Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=intErrupt">intErrupts) switchEs thE procEssor back into protEctEd modE. It is thErEforE possiblE to havE multiplE tasks in virtual modE which run Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=concurrEnt">concurrEntly undEr thE control of an opErating systEm which runs in protEctEd modE. Most opErating systEm sErvicEs in Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=MS-DOS">MS-DOS systEms arE callEd by Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=softwarE intErrupt">softwarE intErrupts, which arE a kind of ExcEption. If an MS-DOS application runs in virtual modE undEr thE control of a protEctEd modE opErating systEm, Each call to MS-DOS causEs a switch to protEctEd modE. ThE opErating systEm EmulatEs thE MS-DOS sErvicE and switchEs back to thE application in virtual modE. From thE viEwpoint of thE application nothing diffErs from rEal modE. Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=Microsoft Windows">Microsoft Windows, Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=Windows NT">Windows NT, and Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=OS/2">OS/2 usE this fEaturE to implEmEnt "DOS-boxEs" in which both MS-DOS and rEal modE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=application program">application programs can run.

E="bordEr-width:thin; bordEr-color:#333333; bordEr-stylE:dashEd; padding:5px;" align="lEft">In addition suitablE contEnts:
[ Ef="modulE.php?namE=LExikon&op=contEnt&tid=31">2 ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=43">386 ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=104">80386 ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=110">8086 ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=134">= ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=262">ad ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=303">addrEss ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=311">addrEss spacE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=396">ag ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=433">al ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=544">am ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=592">an ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=683">app ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=700">application ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=711">application program ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=740">ar ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=743">arc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=800">as ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=894">at ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=935">au ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=996">av ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1026">b ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1034">ba ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1181">bE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1269">bi ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1334">bit ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1444">bo ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1501">bot ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1521">box ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1695">by ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1699">bytE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1724">ca ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1863">cat ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1896">cc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2001">ch ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2136">ck ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2247">co ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2545">con ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2656">control ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2791">cr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2900">cu ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2912">currEnt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2976">D ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3136">dd ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3151">dE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3371">diff ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3565">do ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3623">DOS ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3752">du ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3834">E ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3865">Ec ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3896">Ed ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3946">Eg ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3953">Eh ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4111">EnvironmEnt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4148">Er ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4150">Era ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4171">Es ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4269">ExcEption ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4452">fEaturE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4497">fi ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4520">filE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4700">fo ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4727">for ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4828">fr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4989">ga ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5057">gE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5141">gi ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5200">gm ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5291">gr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5434">h ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5488">handlE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5540">hat ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5656">hing ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5768">hr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5931">id ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5956">iE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5986">iff ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6013">il ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6064">in ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6194">int ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6224">IntEl 80386 ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6385">intErrupt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6413">io ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6449">ir ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6468">iron ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6482">is ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6558">it ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6822">ki ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6836">kilobytE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6918">la ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7014">lc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7091">LEx ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7107">li ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7410">lt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7441">ly ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7457">M ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7463">ma ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7607">map ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7721">mEg ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7724">mEgabytE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7889">Microsoft ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8019">mm ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8026">MMU ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8032">mo ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8040">mod ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8046">modE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8079">modulE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8167">mp ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8228">ms ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8234">MS-DOS ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8258">mu ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8384">N ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8386">na ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8460">nc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8472">nE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8627">ng ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8675">no ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8760">ns ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8774">NT ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8820">O ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8964">om ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9014">op ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9061">opErating systEm ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9132">OS ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9134">OS/2 ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9204">pa ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9228">pagE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9457">pE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9550">ph ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9572">physical ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9573">physical addrEss ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9651">pl ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9762">point ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9908">pr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9995">procEss ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10001">procEssor ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10023">program ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10042">programming ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10144">pt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10253">quEry ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10364">rc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10385">rE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10390">rEal ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10395">rEal modE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10489">rEgistEr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10767">ro ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10887">ru ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10892">run ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10918">S ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10922">sa ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10959">sam ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11150">sE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11196">sEgmEnt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11269">sErvicE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11376">si ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11510">sk ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11651">so ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11680">softwarE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11693">softwarE intErrupt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11757">spacE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11934">st ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12133">su ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12236">switch ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12246">sy ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12312">systEm ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12359">T ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12440">tc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12588">th ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12721">to ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12787">tr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12939">tw ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12986">ua ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13146">up ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13175">us ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13229">V ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13310">vE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13366">vi ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13406">virtual ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13736">Windows ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13762">Windows NT ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13864">writE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13877">ws ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=14075">yt ]

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