Intel D845GEBV2 BLKD845GERG2-10PK 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 ICH4 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 COM2 

(Note 1)

 

4 COM1 

(Note 1)

 

5 

LPT2 (Plug and Play option)/User available 

6 Diskette 

drive 

7 LPT1 

(Note 1)

 

8 Real-time 

clock 

9 

Reserved for ICH4 system management bus 

10 User 

available 

11 User 

available 

12 

Onboard mouse port (if present, else user available) 

13 

Reserved, math coprocessor 

14 

Primary IDE (if present, else user available) 

15 

 

Secondary IDE (if present, else user available) 

16 

(Note 2)

 

USB UHCI controller 1 (through PIRQA) 

17 

(Note 2)

 AC 

’97 audio/modem/User available (through PIRQB) 

18 

(Note 2)

 

ICH4 USB controller 3 (through PIRQC) 

19 

(Note 2)

 

ICH4 USB controller 2 (through PIRQD) 

20 

(Note 2)

 

ICH4 LAN (optional) (through PIRQE) 

21 

(Note 2)

 

User available (through PIRQF) 

22 

(Note 2)

 

User available (through PIRQG) 

23 

(Note 2)

 

ICH4 USB 2.0 EHCI controller/User available (through PIRQH) 

Notes:  

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

2.  Available in APIC mode only.