电脑主板诊断测试卡-英文说明书

ComputerMainBoarddefectPostCard电脑主板故障诊断卡OperatingInstructions说明书(thereareeditionsinChineseforyoutochoose)(可选配中文版)☻ThegloballyuniqueMainboardRunIndicativeLightthatisnewisonit;☻It’stheSMDdevicethatdonoharmtohands;☻ThemanualisupdatedandyoucanchooseitinEnglishorinChinese;☻It’sthefunctionthatasoundremindyouthereisatrouble;☻ThecardcaninsertineitherPCIslotorISAslot;☻Itdonoharmtothedevisewhileyouinsertthecardwronglyandmakeitfunctioned.☻Itcandisplaythecausecodeeventhoughthecomputerstoprunninginthestateofblackscreen.☻ItcantestimportantsignalsoftheMainboardevenwithoutCPUwhenit’sonpower.Thenumberofpatent：01224987.4Thenumberofcertificate：513427InfringementmustbeinvestigatedDevelopedbyHuaTongelectricalcompanyofGuangzhouProvinceinChinaEmail：P678@163.netIntroduceoftherunLEDTherunLEDmakesuseofonlyafewcomponentsandcircuitandneedsafewsignalsofthemainboard’sslot.TheprobabilityofthetroublewiththerunLEDisverysmall.Eventhoughyouplugthecardinthebadslot,thecarddosenotindicatetheerrorcode,eventotheextentthatAlllightsisoffexceptthattherunlightcanbequitepossibletorunnormally.Youcansolvethefollowingproblemsbytheresultof“IftherunLEDhadsparkledthemainboardhadevenrun.”Thepartofthecodesofthecardisbad;Thecardisnotcompatiblewiththemainboardwhichyouareusing;PCIslotorISAslotisbad;Thecard’sinterfacecannotmatchtheslotwellbythecauseofthecard‘spluggingincorrectly,thedirtyoftheinterface,therustyslotandsoon.Themainboardmaystoprunning;Themainboardisrunningwithprogramswhichisoutofrelationtothecodes;DistinguishtrueandfalseThePI0050ismorecompatiblethantheeconomicalandreallyusefulPI0049withmainboardofsuperiorqualitysuchasPⅢ、PIVandsoon.SoyoucandistinguishthePI0049regardedasPI0050bytheircharacteristicsasfollows,andalsoyoucandialthisnumber08613925174332orwritetomebyE-mail:p678@163.nettothegetlastestdistinguishingmessages.TRUE●Thereis“ChinaCopyright01224987.4”ontheedgeofPCB;TRUE●Thereis“ChinaCopyright513427”onPI0049、pi0050;●Onthebackofthecard,thereisatelephonenumberof“08613925174332;FLASEThecharacteristicsofspuriouscardsthathavebeenknown:FLASE●”中国专有号：01223987.3”●”专有技术：01224988.3”●”专利号：02125087.5”(Itisthepatentofbiologyorganiccompound)●Becareful!Thespuriouscardsalwaysaremadeofbadorunsuitablematerials.Ithasn’tbeentestedbytheprofessionalequipmentandhasnosimulationtechnique.Atthesametime,theremaybeafewI0049cardregardedasthePI0050cardtosell.Catalogue=1\*GB1⒈Synopsis……………=2\*GB1⒉Obligatorycontents…………………=3\*GB1⒊Hexadecimalcharactertable……………………….=4\*Arabic4.DescriptionofLEDdisplays………………………=6\*GB1⒍Flowchart………………………….=7\*GB1⒎Errorcodestable…………………….=8\*GB1⒏Descriptionofbeepcode…………..AMIBIOSbeepcodes(fatalerror)……………………...AMIBIOSbeepcodes(Non-fatalerror)………………...AwardBIOSbeepcodes…………………PhoenixBIOSbeepcodes………………..IBMBIOSbeepcodes……………………=9\*GB1⒐CorrectiveAction…………………..IfIforgetthepassword,whatcanIdo?………………….=1\*GB3①Omnipotentpassword……………………..AMIpassword…………..Awardpassword…………Otherways………………=2\*GB3②Dischargebysoftware…………………….=3\*GB3③Dischargebyhardware……………………=4\*GB3④.Otherway………………...HowtoenterCMOSSETUP?……………=10\*GB1⒑Answersoffrequently-askedquestions…………….=11\*GB1⒒Ifthecodeisnotincludedinthebook,whatcanIdo?………………..……………=1\*GB1⒈SYNOPSISThecardisnamedPOST(PowerOnSelfTest)cardtoo,itcoulddisplaytheerrorcodebytheresultofPOST,thenyouwouldsoondeterminecauseoftheerrorbyerrorcodestable.EspeciallywhenthePCcan’tbootoperatingsystem,oritisablackscreen,orthecardandmotherboardcouldn’tissueanaudiblebeep.Itisapowerfuldiagnostictool.Nowjustuseit,you’llgettwicetheresultwithhalftheeffort.Whenthepoweristurnedon,theBIOSfirstwouldhaveastricttestwithsystemcircuit、memory、keyboard、video、harddisc、floppydriveandsoon.ItanalyzesthesystemconfigurationandinitializesthebasicI/Osetup.Atlastwhenallisnormal,itbootstheoperatingsystem.Theobviousfeatureoftestingcrucialcomponentsisdemarcatebycurse’sappearing.Atfirst,theBIOSteststhecrucialcomponents.Ifthetestingisabnormal,thecomputerstoppedcompulsively;Thecursecannotappearinthescreen;Thereisnoresponsetothescreen.TheBIOStestscommoncomponentsafterwards.Ifthetestingisabnormal,thecomputercontinuestorunanddisplaystheinformationoferror.Whenthereissometroublewiththecomputerandthetestingisabnormal,especiallythetestingcrucialcomponent,nodisplayinginthescreen,theblackscreen,youcanputthePostcardintheexpansiveslot.Youwillknowthecauseofthetroublebythecodethatthecardindicatesandtheerrorcodestableofthismanual.=2\*GB1⒉OBLIGATORYCONTENTS1.Theerrorcodestableisintheorderofthecodes’valuefromsmalltobig.ThesequenceinwhichthecodedisplaysisdecidedbyBIOSofthemotherboard.2.YoumustidentifythatthecodethatPOSTcarddisplayedis"initiativecode"or"Errorcode"."initiativecode"ismeaningless.=1\*GB3①Howdowedistinguish"initiativecode"or"Errorcode"ofconventionaltwo-bit-codePOSTcard?Whenconventionaltwo-bit-codePOSTcarddisplayedacode.Atfirst,wemustseewhethertherehavebeensomeothercodesvaryingbeforethecodeisdisplayed.Iftherehavebeensomecodesvaryinganditstopsatacertaincodeintheend,thecodeisthe"errorcode";Ifthedisplayedcodeisfirstcodeandyoucannotseeanyothercodevaryingbeforeit,thecodeisthe"initiativecode".The"initiativecode"ismeaningless.ButsometimesthespeedofmuchcodevaryingistoofastsothatbyunaidedeyewecannotmakeajudgementwhethertherehavebeensomeothercodesvaryingbeforeitstopsatthecertaincodethatIcanseeintheend.Youneedconsiderthiscodeasthe“Errorcode"hereinthiscondition.Ifyouhavenotsolvethetrouble,thiscodemustbethe"initiativecode".Aslongascode"0000"or"FFFF"isdisplayedbyfour-bit-codePOSTcard,thecode"0000"or"FFFF"is"initiativecode".Itisnoneedforyoutomakeajudgmentbyunaidedeyewhethertherehavebeensomeothercodesvaryingbeforeitstopsatthecode"0000"or"FFFF".=2\*GB3②Whyisthe"initiativecode"meaningless?Thefirstcodethatisdisplayedwhenpowerisonisnamed"initiativecode"byus,becausethedebugcardisalsoelectronicaldeviceitself.Whenthepowerison,thecardwilldisplayonetwo-bitcodeautomatically.Itistheinitiativecode.ButthecodeisnotthePOSTcode(referredtothe"SYNOPSIS"inthechapteroneofthemanual)ofthecomputer.Sothe"initiativecode"ismeaningless.3.Thecodesthathaven’tbeendefinedisnotincludedinthetable.4.ForthedifferentBIOS(suchasAMI、Award、Phoenix),thecodeismeaningdifferently.SoyoumustmakesurethatwhichkindofBIOSyouaretestingbyviewingtheusers’guide、SeeingsymbolontheBIOSICofthemotherboardorseeingthescreendirectlywhilethecomputerbooting5.ThereisnomorethansomecodedisplayedwhenyouinsertthecardintothePCIslotonafewbrandsofmotherboards,butwhenyouplugitintotheISAslot,allthecodecanbedisplayed.Atpresent,ithasbediscoveredthatallcodesisdisplayedwhenyouinsertthecardintothePCIslotofseveralbrandsofcomputerswhichnotallcodesisdisplayedwhenyouplugthecardintheISAslot.Sowesuggestthatyouneedplugthecardfromoneslottoanotherslotwhenconsultingthecodeisunsuccessful.Inaddition,thedifferentslotonthecertainmotherboardinthedifferentstates.Forexample,allcodescanbedisplayedfrom“00”to“FF”whenyouplugthecardinthePCIslotthatisneartheCPUonthemotherboardDELL810whileonlyapartofcodescanbedisplayedfrom“00”to”38”whenyouplugthecardintheotherPCIslotonthemotherboardDELL810.6.ThetimeofPCIthattheresettingsignalneedsisnotalwayssynchronizedwiththetimeofISA.SosometimesthecodebegintobedisplayedwhenthecardintheISA,buttheresettinglightofPCIhasnotbeenoffwhilethecardstopstodisplaytheoriginalcode.7.Astherearemoreandmoredifferentkindsandstructuresofthemotherboard,andthecodesofBIOSPOSTisupdatedconstantly,sothecauseoftroublethaterrorcodeindicatesisjustareferenceforyou.8.Accordingtoexperience,thecardoftwo-bitcodeisreliableifyouplugitintheslotonthemotherboardbelowandincludingthePⅡ300.Itwillstoprunningoritdosenotindicatetheerrorcodeoritindicatesfalseerrorcode.Asuntilrecentlywehaven’treceivedthebadreflectaboutthefour-bitcodecardofP0050.Wesuggestyoubuyandusethefour-bitcodecardofP0050.=3\*GB1⒊Hexadecimalcharactertable=5\*GB1⒌DescriptionofLEDdisplaysLEDSignalTypeDescriptionRUNBuspulseIftheLEDsparkles,themainboardhasbeenrunning.Ifthemanboardhasn’trun,theLEDisoff.CLKBusclockAslongasthemainboardisonpowerafteryouplugthecardineitherPCIslotorISAslot,theLEDison.orelsethereisnobusclocksignal.BIOSBaseinput/outputsignalsAslongastheCPUisreadingtoBIOSwhentheboardisonpowered,theLEDsparkles.IRDYMainequipmentsisreadyTheLEDsparkleswhenthereisaIRDYsignal.OSCOscillationsignalItisoscillationsignalofISAslot.TheLEDshouldbeon,AslongasthePowerisonafteryouplugthecardintheISAslotonthemainboard.Orelsethecrystaloscillationcircuitisbroken,andthereisnoOSCsignal.FRAMEFrameperiodsItiscycleframesignalofPCIslot.TheLEDshouldbeon,AslongasthePowerisonafteryouplugthecardinthePCIslotonthemainboard.TheLEDsparkleswhentheFRAMEsignaliscoming.OrelsethereisnoFRAMEsignal.Lightsallthetime.RSTResettingsignalTheLEDoughttohavebeenonforhalfsecondsinceyoupressthepowerswitchortheresetswitch.Ifitisonallthetime,pleasecheckwhethertheresettingpinconnectstotheacceleratingswitchormakesupashortcircuitorthereissometroublewiththeresettingcircuit.12VPowerTheLEDshouldbeon,AslongasthePowerisonafteryouplugthecardintheslot.Orelsethereisnovoltageof12Vorthereisshortcircuit.-12VPowerTheLEDshouldbeon,AslongasthePowerisonafteryouplugthecardintheslot.Orelsethereisnovoltageof-12Vorthereisshortcircuit.5VPowerTheLEDshouldbeon,AslongasthePowerisonafteryouplugthecardintheslot.Orelsethereisnovoltageof5Vorthereisshortcircuit.-5VPowerTheLEDshouldbeon,AslongasthePowerisonafteryouplugthecardintheISAslot.Orelsethereisnovoltageof-5Vorthereisshortcircuit.(Thereisown-5VofISAslot.)3V3PowerThereisthepropervoltageof3V3ofthePCIvolt.TheLEDshouldbeon,AslongasthePowerisonafteryouplugthecardinthePCIslot,butsometimestheLEDmaybeoffbythereasonthatthereisnovoltageof3V3ofafewPCIslotorthereisopencircuit.=6\*GB1⒍FlowchartBeginBeginPoweroffPoweroffandremoveallthecardsthatpluginexpansionslot.InsertthecardintoISAorPCIslot.(Notice:WhenyouplugitintheISAslotthecomponentsideshouldfacetothepower,ifitpluggedinthewrongdirection,thecardandmotherboardisnotbroken,butboththecardandthemainboardstoprunning.Accordingtothe“DescriptionofLEDdisplayingAccordingtothe“DescriptionofLEDdisplaying”,youcanfindthecauseofthetroubleandcorrectitNOPoweron;JudgeIftheNOPoweron;JudgeIfthealllightsrunnormally.(TheBIOSlightmaybeonlowpowertosparkleAccordingtotheerrorcodetable,youcanfindthecauseofthetroubleandcorrectitAccordingtotheerrorcodetable,youcanfindthecauseofthetroubleandcorrectitYES YESYESJudgewhethertheerrorcodeJudgewhethertheerrorcodethatmeansthereisatroublewiththemainboardisdisplayedNONOPoweroff,AccordingtotheerrorcodetablePoweroff,Accordingtotheerrorcodetable,youcanfindthecauseofthetroubleandcorrectitPoweroff,insertthedisplaycard、I/Ocard、keyboard、harddiskdriveandexpansioncardsPoweron,JudgewhethertheerrorcodethatmeansthereisatroublewiththemainboardisdisplayedYESYESNONOEndIftheresultofthetestiscorrecteventhoughitcan’tboottheoperatingsystem,EndIftheresultofthetestiscorrecteventhoughitcan’tboottheoperatingsystem,theremaybesometroublewiththesoftwareordiscdrive,ordiskcontroller,orDMAcircuit.=7\*GB1⒎ErrorcodetableCODEAwardAMIPhoenix4.0/Tandy300000Copyingcodetospecificareaisdone.PassingcontroltoINT19hbootsloadernext.01ProcessorTest1verifiesProcessorstatus(1FLAGS).Testthefollowingprocessorstatusflags:carry,zero,sign,overflow.CPUistestingtheregisterinsideorthetestfails,pleasechecktheCPUorreplaceit.TheBIOSsetseachflagsandverifieswhethertheyareset.AfterthenItturnseachflagoffandverifieswhetheritisoff.02TestAllCPURegistersExceptSS,SP,andBPwithDataFFand00VerifyRealMode03DisableNMI,PIE,AIE,UEI,SQWV.TheNMIisdisabled.Next,ItchecksasoftresetorthepowerconditionDisableNonmaskableInterrupt(NMI)Disablevideo,paritychecking,DMA.Resetmathcoprocessor.Clearallpageregisters,CMOSshutdownbyte.Initializetimer0,1,and2,includingsetEISAtimertoaknownstate.InitializeDMAcontrollers0and1.Initializeinterruptcontrollers0and1.InitializeEISAextendedregisters.04RAMmustbeperiodicallyrefreshedtokeepthememoryfromdecaying.Thisrefreshingfunctionisworkingproperly.GetCPUtype05KeyboardControllerInitializationTheBIOSstackhasbeenbuilt.Next,itdisablecachememory.DMAinitializationisinprogressorfailsCODEAwardAMIPhoenix4.0/Tandy300006ReservedUncompressingthePOSTcodenext.Initializesystemhardware07VerifieswhetherCMOSisWorkingcorrectly,DetectswhetherbatteryisbadInitializetheCPUandtheCPUdataareasubsequently.DisableshadowandexecutecodefromtheROM.08EarlychipsetinitializationTheCMOSchecksumiscomputed.InitializechipsetwithinitialPOSTvaluesMemorypresencetestOEMchipsetroutinesClearlow64KmemoryTestfirst64Kmemory09InitializeCyrixCPUSetINPOSTflagInitializeCache0AInitializefirst120interruptvectorswithSPURIOUS-INT-HDLRandinitializeINT00h-1FhaccordingtoINT-TBL.TheCMOSchecksumcalculationisdone.InitializetheCMOSstatusregisterfordateandtimenext.InitializeCPUregisters0BTestCMOSRAMChecksum,ifitisbad,orINSKeyisPressed,LoadthedefaultTheCMOSstatusregisterisinitialized.Next,performinganyrequiredinitializationbeforethekeyboardBATcommandisissuedEnableCPUcache0CDetectTypeofKeyboardController.Thekeyboardcontrollerinputbufferisfree.Next,issuetheBATcommandtothekeyboardcontroller.InitializecachestoinitialPOSTvaluesSetNUM_LOCKStatus0DDetectCPUClock;ReadCMOSlocation14htofindouttypeofvideoinuse.Detectandinitializevideoadapter.CODEAwardAMIPhoenix4.0/Tandy30000ETestVideoMemoryandwritesign-oninformationtoscreen.ThekeyboardcontrollerBATcommandresulthasbeenverified.Next,performanynecessaryinitializationafterthekeyboardcontrollerBATcommandtestInitializeI/OcomponentSetupshadowRAM?Enableshadowaccordingtosetup.0FTestDMACont.0;BIOSChecksumTest.TheinitializationafterthekeyboardcontrollerBATcommandtestisdone.Thekeyboardcommandbyteiswrittennext.InitializethelocalIDEbus.DetectandInitializeKeyboard.10TestDMAController1Thekeyboardcontrollercommandbyteiswritten.Next,issuethePin23and24blockingandunblockingcommandInitializePowerManagement11TestDMAPageRegistersNext,checkif<End>or<Ins>keyswerepressedduringpoweron.InitializingCMOSRAMiftheInitializationCMOSRAMineverybootAMIBIOSPOSToptionwassetinAMIBCPorthe<End>keywaspressed.LoadalternateregisterswithinitialPOSTvalues12ReservedNext,disablingDMAcontrollers1and2andinterruptcontrollers1and2RestoreCPUcontrolwordduringwarmboot13ReservedThevideodisplayhasbeendisabled.PortBhasbeeninitialized.Next,initializethechipset.InitializePCIBusprimarydevicesCODEAwardAMIPhoenix4.0/Tandy300014Test8254Timer0Counter2The8254timertestwillbeginnext.Initializekeyboardcontroller15Verify8259Channel1InterruptsbyTurningOffandOntheInterruptLina16Verify8259Channel2InterruptsbyTurningOffandOntheInterruptLinaBIOSROMchecksum17TurnOffInterruptsandverifywhetherNonmaskableInterruptRegisterisOnInitializecachebeforememoryAutosize18ForceanInterruptandVerifytheInterruptOccurring.Initialize8254timer.19TestStuckNMIBits;VerifywhetherNMICanBeClearedThe8254timertestisover.Starting.Thememoryrefreshtestisafterthat1ADisplayCPUclockThememoryrefreshinglinaistriggered.Checkthe15microsecondon/offtimenextInitialize8237DMAcontroller1BReserved1CReservedResetProgrammableInterruptController1DReserved1EReserved1FIfEISAnon-volatilememorychecksumisnormal,executeEISAinitialization.Ifnot,executeISAtestsandclearEISAmodeflag.TestEISAconfigurationmemoryIntegrity(checksum&communicationinterface).20InitializeSlot0(SystemBoard)TestwhetherDRAMrefreshes.21InitializeSlot122InitializeSlot2Test8742KeyboardControllerCODEAwardAMIPhoenix4.0/Tandy300023InitializeSlot3Readthe8042inputportanddisabletheMEGAKEYGreenPCfeaturenext.MaketheBIOScodesegmentrewriteandperformanynecessaryconfigurationbeforeinitializingtheinterruptvectors24InitializeSlot4Theconfigurationisrequiredbeforeinterruptvectorinitializationhascompleted.InterruptvectorinitializationisabouttobeginSetESsegmentregisterto4GB25InitializeSlot5Interruptvectorinitializationisdone.ClearingthepasswordifthePOSTDIAGswitchison.261.testtheexceptionsituationofprotectedmode.PleasecheckthememoryofCPUandmainboard.

2.nofataltrouble,VGAdisplayednormally.Ifnonfatefultroubleoccurred,thendisplayerrormessageinVGA,elseBootoperatingsystem.Nowcode26isOKcode,andnoanyothercodescanbedisplayed.1.Read/write、input、outputportof8042keyboard,readyforresolvemode,continuetogetreadyforinitializationofalldata,checkthe8042chipsonmainboard.2.referedtotheleft.1.enableA20addressline,checktheA20pinsofmemorycontrollingchips,andcheckcircuit,correlatedtopins.Inmemoryslot,maybeA20pinandmemorypinsarenotincontact,ormemoryA20pinsbad.2.referedtotheleft.27InitializeSlot7Anyisinitializedbefore.Settingvideomodewillbedonenext28InitializeSlot8Initializationisdonebefore.Settingthevideomodecompletes.ConfigurethemonochromemodeandcolormodesettingsnextAutosizeDRAM29InitializeSlot9InitializePOSTMemoryManagement2AInitializeSlot10Initializethedifferentbussystemandstaticoutputdevices,ifitispresentClear512KBbaseRAM2BInitializeSlot11PassingcontroltothevideoROMtoperformanyrequiredconfigurationbeforethevideoROMtest.2CInitializeSlot12AllnecessaryprocessingbeforepassingcontroltothevideoROMisdone.LookforthevideoROMnextandpasscontroltoit.RAMfailsonaddressllinaXXXX*2DInitializeSlot13ThevideoROMhasreturnedcontroltoBIOSPOST.PerforminganyrequiredprocessingisafterthevideoROMhadcontrol.2EInitializeSlot14Completepost-videoROMtestprocessing.IftheEGA/VGAcontrollerisnotfound,performthedisplaymemoryread/writetestnextRAMfailsondatabitsXXXX*oflowbyteofmemorybus2FInitializeSlot15TheEGA/VGAcontrollerwasnotfound.Thedisplaymemoryread/writetestisabouttobeginEnablecachebeforesystemBIOSshadow30SizeofbaseMemoryFrom256Kto640KandMemoryisExtendedAbove1MB.Thedisplaymemoryread/writetestpassed.Lookforretracingcheckingnext31TestBaseMemoryFrom256Kto640KandMemoryExtendedAbove1MBThedisplaymemoryread/writetestorretracingcheckingfailed.Performthealternatedisplaymemoryread/writetestnext32IfEISAMode,TestEISAMemoryFoundinSlotsInitializationThealternatedisplaymemoryread/writetestpassed.Lookforalternatedisplayretracingcheckingnext.TestCPUbus-clockfrequency33ReservedInitializePhoenixDispatchmanager34ReservedVideodisplaycheckingisover.Setthedisplaymodenext.35Reserved36ReservedWarmstartandshutdown37ReservedThedisplaymodeisset.Displayingtheinformationwhenitbootsnext.38ReservedInitializethebusinput,IPLandgeneraldevicesnext,ifpresentShadowsystemBIOSROM39ReservedDisplaybusinitializationerrormessages.3AReservedThenewcursorpositionhasbeenreadandsaved.DisplaytheHit<DEL>messagenextAutosizecache3BReservedTheHit<DEL>messageisdisplayed.Theprotectedmodememorytestisabouttostart.3CSetupEnabledAdvancedconfigurationofchipsetregisters3DDetectifMouseisPresent,InitializeMouse,InstallInterruptVectorsLoadalternateregisterswithCMOSvalues3EInitializeCacheController3FReserved40DisplayVirusProtestDisabledorEnabledPreparethedescriptortablesnext41InitializeFloppyDiskDriveControllerandAnyDrivesInitializeextendedmemoryforRomPilot42InitializeHardDriveControllerandAnyDrivesThedescriptortablesareprepared.EnterprotectedmodeforthememorytestnextInitializeinterruptvectors43DetectandInitializeSerial&ParallelPortsandGamePortEnteredprotectedmode.Enableinterruptsfordiagnosticsmodenext.44ReservedInterruptsisenabledifthediagnosticsswitchison.Initializedatatocheckmemorywrappingaroundat0:0next.45DetectandInitializeMathCoprocessorDatainitialized.Checkformemorywrappingaroundat0:0andfindthetotalsystemmemorysizenextPOSTdeviceinitialization46ReservedThememorywrappingaroundtestisdone.Memorysizecalculationhasbeendone.WritingpatternstotestmemorynextCheckROMcopyrightnotice47ReservedThememorypatternhasbeenwrittentoextendedmemory.Writepatternstothebase640KBmemorynext.InitializeI20support48ReservedPatternswriteinbasememory.Determinetheamountofmemorybelow1MBnext.CheckvideoconfigurationagainstCMOS49ReservedTheamountofmemorybelow1MBhasbeenfoundandverified.Determinetheamountofmemoryabove1MBmemorynext.InitializePCIbusanddevices4AReservedReservedInitializeallvideoadaptersinsystem4BReservedTheamountofmemoryabove1MBhasbeenfoundandverified.Checkforasoftresetandclearthememorybelow1MBforthesoftresetnext.Ifthisisapoweronsituation,gotocheckpoint4Ehnext.QuietBootstart(optional)4CReservedThememorybelow1MBhasbeenclearedviaasoftreset.Clearthememoryabove1MBnext.ShadowvideoBIOSROM4DReservedThememoryabove1MBhasbeenclearedviaasoftreset.Savethememorysizenext.Gotocheckpoint52hnext4ERebootifitisManufacturingMode;Ifnot,DisplayMessagesandEnterSetupThememoryteststarted,butnotastheresultofasoftreset.Displayingthefirst64KBmemorysizenext.DisplayBIOScopyrightnotice4FAskPasswordSecurity(Optional)Thememorysizedisplayhasstarted.Thedisplayisupdatedduringthememorytest.PerformthesequentialandrandommemorytestnextInitializeMultiBoot50WriteAllCMOSValuesBacktoRAMandClearThememorybelow1MBhasbeentestedandinitialized.Adjustthedisplayedmemorysizeforrelocationandshadowingnext.DisplayCPUtypeandspeed51EnableParityChecking.EnableNMI,EnableCacheBeforeBootThememorysizedisplaywasadjustedforrelocationandshadowing.Testingthememoryabove1MBnext.InitializeEISAboard