Possibly an ovbious one

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I've been reading my older Mr Myers book which goes through the IRQ's which i think i have a basic understanding of - i'm just wondering why when i look at system information have i got 16-23 IRQ listed? admiteddly it was a couple of weeks ago i was looking at that book, and i'm waiting for the new one to arrive!
Apologies if its ovbious!
ps - i have noticed there's a few USB devices in this range - is it because they can share IRQ's there just given an extra number? ...now looking i've got 2 on IRQ sixteen but its not causing any problems....

 

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I am not too sure but i think the usb controller controls all the usb irqs so all the usb devices on the same controller can share the same irq.

 

I've got 4 things on IRQ 16 and no problems, maybe because devices can share an IRQ if they're not going to interfere with each other.

 

think your probably right, just wondering where these extra IRQ's 20 /23 etc have come from?

 

Virtual IRQs.

 

Perhaps the older book only has the PIC (Programmable Interrupt Controller) IRQ system, in the updated book it states there are 24 IRQ's ranging from 0-23 using the newer IOAPIC system. (I/O Advanced Programmable Interrupt Controller).

 

yeah fairplay, i'll wait for the new book ;) i just googled virtual IRQ's