Specifications

Chapter 5: Setup 5-7
Allocating Interrupts
Onthe7401,limitedcontrolofinterruptallocationisprovided through
theBIOSSetupUtility.DuetothenatureofthePCIbus,thePlugand
PlaysubsystemallocatestheinterruptsofPCIdevicesusingall
availableinterrupts.
TofreeIRQ15,itisnecessarytodisablethesecondaryIDEbus.To
do
this,intheAdvancedmenu,choosePrimaryintheLocalBUSIDE
adapterselection.
TofreeIRQs4,3,or7,intheI/ODeviceConfigurationselection,disable
COMA,COMB,ortheParallelport,respectively.
Tofinalizethefreeingofinterruptsandmakeunusedinterrupts
availablefor
usebyPCIdevices,itisnecessarytoresetthe
configurationdata.ThiscanbedoneintheAdvancedmenu.
TouseISAdevicesthatrequireinterrupts,itisnecessarytoreserve
thoseinterruptssothatthoseinterruptsarenotallocatedbytheBIOS
toPCIdevices.Todothis,in
theAdvancedmenu,chooseAdvanced
ChipsetControl.ChoosePCI/PNPIRQResourceExclusion,thensetall
ISAinterruptstoReserved.

Restoring Factory Settings
Toautomaticallyresetallvaluestotheirdefaultsettingsforthecurrent
screen,pressF9.TheterminalwillautomaticallyloadBIOSdefault
CMOSvaluesforbootup.
ToresetallBIOSsettingstotheirdefaultsettingsgototheExitmenu,
pressF9,selecteitherSaveChanges&Exitor
SaveChanges,andpress
Enter.
Refertothe“BIOSDefaultCMOSValues”sectionlaterinthischapter
forthepre‐installedSetupdefaults.