Technical Information 1-12
Interrupt Controller
The interrupt controller operates as an interrupt manager for the entire AT 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 which interrupt routine to execute. The interrupt controller has priority
assignment modes that can be reconfigured at any time during system operations.
The interrupt levels are described in Table 1-5. Interrupt-level assignments 0 through 15 are
in order of decreasing priority. See Section 2, Setup and Operation, for information on
changing the interrupts using Setup.
Table
1-5
Interrupt
Assignments
Interrupt
Priority
Interrupt Device
IRQ00
Counter/Timer
IRQ01
Keyboard
IRQ02
Cascade (INT output from slave)
IRQ03
COM2
IRQ04
COM1
IRQ05*
Parallel Port 2/Audio (if present)
IRQ06
Diskette Drive Controller
IRQ07
Parallel Port 1
IRQ08
Real-time clock
IRQ09*
Audio (if present)/Available
IRQ10*
Available
IRQ11
ATI 3D Rage II/
IRQ Holder for PCI steering/
Intel 82371SB to USB Universal Host
Controller
IRQ12
PS/2 mouse
IRQ13
Coprocessor
IRQ14
Primary IDE
IRQ15
Secondary IDE
* Multimedia configurations use one of these interrupts.
Summary of Contents for POWERMATE P2166
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