Intel Desktop Board D945GPM BOXD945GPMLKR User Manual

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The interrupts can be routed through either the Programmable Interrupt Controller (PIC) or the 
Advanced Programmable Interrupt Controller (APIC) portion of the ICH7DH component.  The PIC 
is supported in Windows 98 SE and Windows ME and uses the first 16 interrupts.  The APIC is 
supported in Windows 2000 and Windows XP and supports a total of 24 interrupts. 

NMI 

I/O channel check 

0 

Reserved, interval timer 

1 

Reserved, keyboard buffer full 

2 

Reserved, cascade interrupt from slave PIC 

3 User 

available 

4 COM1 

(Note 1)

 

5 User 

available 

6 Diskette 

drive 

7 LPT1 

(Note 1)

 

8 Real-time 

clock 

9 User 

available 

10 User 

available 

11 User 

available 

12 

Onboard mouse port (if present, else user available) 

13 

Reserved, math coprocessor 

14 

Primary Parallel ATA/Serial ATA – Legacy Mode (if present, else user available) 

15 

 

Secondary Parallel ATA/Serial ATA – Legacy Mode (if present, else user available) 

16 

(Note 2)

 

User available (through PIRQA) 

17 

(Note 2)

 

User available (through PIRQB) 

18 

(Note 2)

 

User available (through PIRQC) 

19 

(Note 2)

 

User available (through PIRQD) 

20 

(Note 2)

 

User available (through PIRQE) 

21 

(Note 2)

 

User available (through PIRQF) 

22 

(Note 2)

 

User available (through PIRQG) 

23 

(Note 2)

 

User available (through PIRQH) 

Notes:  

1.  Default, but can be changed to another IRQ. 

2.  Available in APIC mode only.