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Possibly an ovbious one

Discussion in 'A+' started by morph, Apr 12, 2007.

  1. morph

    morph Byte Poster

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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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  2. Morne Louw

    Morne Louw Byte Poster

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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.
     
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  3. Bambino1506

    Bambino1506 Megabyte Poster

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    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.:eh
     
    Certifications: MCP,MCDST,MCSA
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  4. morph

    morph Byte Poster

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    think your probably right, just wondering where these extra IRQ's 20 /23 etc have come from? :)
     
    Certifications: Network +, ITIL Foundation, CCENT, CCNA
    WIP: server/ccna security
  5. BosonMichael
    Highly Decorated Member Award

    BosonMichael Yottabyte Poster

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    Virtual IRQs. :)
     
    Certifications: CISSP, MCSE+I, MCSE: Security, MCSE: Messaging, MCDST, MCDBA, MCTS, OCP, CCNP, CCDP, CCNA Security, CCNA Voice, CNE, SCSA, Security+, Linux+, Server+, Network+, A+
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  6. nXPLOSi

    nXPLOSi Terabyte Poster

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    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).
     
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  7. morph

    morph Byte Poster

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    yeah fairplay, i'll wait for the new book ;) i just googled virtual IRQ's :eek:
     
    Certifications: Network +, ITIL Foundation, CCENT, CCNA
    WIP: server/ccna security

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