Interrupt and DMA Assignments
Most IRQ assignments are dynamic because of Plug-and-Play and PCI configuration. However, some are
fixed based on legacy requirements, as shown in the table below. Because the SurePOS 500-XX3 design will
make use of the APIC interrupt controller in the ICH4, there will be 20 interrupts instead of 16 as we had in
the previous designs. The legacy ISA interrupts are the same from 0 - 15, and interrupts 16-19 correspond
to the PCI interrupts INTA, INTB, INTC, and INTD. Thus PCI devices no longer need to take an ISA interrupt
with the APIC design.
IRQ Number Resource Notes...
0 System Timer NS (Not Sharable)
1 PS2 Keyboard NS
2 Cascade NS
6 Floppy Drive NS, available if floppy not attached or
enabled
8 RTC NS
12 Mouse NS, available is mouse not attached or
enabled
13 Floating Point NS
14 HDD controller NS
Below is a list of other resources that will be configured to any available interrupt:
Resource Notes
Serial A Relocate and can be Disabled
Serial B Relocate and can be Disabled
LPT1 Relocate and can be Disabled
Ethernet Relocate and can be Disabled
PCMCIA Relocate and can be Disabled
Audio Relocate and can be Disabled
USB Relocate and can be Disabled
MSR Relocate and can be Disabled
VFD Relocate and can be Disabled
Serial C Relocate and can be Disabled
SurePOS 500 Model XX3 Technical Reference, v 1.3 Page 41 of
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