1-10 Technical InformationInterrupt ControllerThe interrupt controller operates as an interrupt manager for the entire system environment.The controller accepts requests from peripherals, issues interrupt requests to the processor,resolves interrupt priorities, and provides vectors for the processor to determine whichinterrupt routine to execute. The interrupt controller has priority assignment modes that canbe reconfigured at any time during system operations.The interrupt levels are described in Table Section 1-4. Interrupt-level assignments 0through 15 are in order of decreasing priority. See Section 2, “Setup and Operation”, forinformation on changing the interrupts using Setup.Table Section 1-4 Interrupt Level AssignmentsInterrupt Priority Interrupt DeviceNMI I/O channel checkIRQ00 Reserved, Interval TimerIRQ01 Reserved, Keyboard buffer fullIRQ02 Reserved, Cascade interrupt from slaveIRQ03 Serial Port 2IRQ04 Serial Port 1IRQ05 On-board audio (on multimedia configurations) orUser AvailableIRQ06 Diskette Drive ControllerIRQ07 Parallel Port 1IRQ08 Real-time clockIRQ09 On-board audio (on multimediaconfigurations) or User AvailableIRQ10* User Available (SCSI board for SCSIconfigurations)IRQ11* Video boardIRQ12 On-board mouse port (available if no PS/2 mouse)IRQ13 Reserved, Math CoprocessorIRQ14 Primary IDEIRQ15 Secondary IDE if present, or else user available* These slots are selected and used by the installed expansion boards.
