2 IRQ controllers?

  • Thread starter Thread starter esara
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esara

Hi
I am reading that a PC can have 2 IRQ controllers

1) First IRQ Controller
2) Second IRQ Controller

the 2nd one is just connected to the first one in case I need more IRQ
(extended). My question is that the case in the new PCs or this is old
reading? thanks a lot..
 
esara said:
Hi
I am reading that a PC can have 2 IRQ controllers

1) First IRQ Controller
2) Second IRQ Controller

the 2nd one is just connected to the first one in case I need more IRQ
(extended). My question is that the case in the new PCs or this is old
reading? thanks a lot..
Click to expand...


It's been that way for quite a while. IRQ 2 is cascaded with IRQ9,
giving your IRQs through 15.

But modern PCs use APIC, which can give you significantly more IRQs.
http://www.microsoft.com/whdc/system/sysperf/IO-APIC.mspx


-WD
 
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