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Thread: I/O addresses

  1. #1
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    I/O addresses

    Hi, Does anyone know where I can get a list of of all I/O addresses and what they are associated with it. I appreciate any help.

    thank you.

  2. #2
    Moderator YeOldeStonecat's Avatar
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    You can find a few lists of them here and there from the old AT days
    http://webpages.charter.net/dperr/irq_io.htm

    ....but it's less important these days with newer APIC standards, more flexible PNP, and NT.
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  3. #3
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    Hi, I am hoping someone could tell me if I have the correct IRQs reserved for their appropriate device? Also, are there certain I/O addresses for every IRQ? If so, what would be the ones that I am missing? Thanks in advance

    IRQs---Devices
    0-----System Timer
    1-----Keyboard Controller
    2-----Tied to IRQs 8-15
    3-----COM 2, COM 4 (Mouse)
    4-----COM 1, COM 3 (Modem)
    5-----LPT2 or Sound Card
    6-----Floppy Diskette Controller
    7-----LPT 1
    8-----Real Time Clock
    9-----Substitutes for IRQ 2
    10----Not Assigned
    11----Not Assigned
    12----PS/2 Mouse Port
    13----Math Co-Processor
    14----Pri. Hard Disk Controller
    15----Sec. Hard Disk Controller

    I/O----Common Device using Address
    130h---Used for SCSI host adapters
    140h---Used for SCSI host adapters
    170h---Secondary IDE Interface
    1F0h---Primary IDE Interface
    220h---Typically used for Sound Blaster-type sound cards
    240h---An alternate address for sound cards
    278h---Assigned to LPT2 or LPT3 and generally used with IRQ 5
    280h---Network Interface cards or the Aria Synthesizer
    2A0h---An alternate address for NIC cards or the Aria Synthesizer
    2E8h---Assigned to COM 4 and used with IRQ 3
    2F8h---Assigned to COM 2 and used with IRQ 3
    300h---Another Network Interface Card choice
    320h---A good place for a Network card, unless there is a SCSI host adapter or MIDI device
    330h---A common place for the SCSI host adapters
    340h---Another good alternative for the SCSI host adapter
    360h---A Network card choice, but beware of the first parallel printer port, this could be a conflict.
    378h---The first parallel printer port (LPT 1) in color systems, commonly used with IRQ 7.
    3BCh---The first parallel printer port (LPT1) in monochrome systems, beware you may have problem assigning this address to a printer port in Windows 95.
    3E8h---Assigned to COM 3 and used with IRQ 4
    3F8h---Assigned to COM 1 and used with IRQ 4



    IRQ I/O ADDRESS's
    4---COM1--------3F8H
    3---COM2--------2F8H
    4---COM3--------3E8H
    3---COM4--------2E8H
    7---LPT1---------378H
    5---LPT2---------278H
    14--Hard disk controller-----1F0H

  4. #4
    Moderator YeOldeStonecat's Avatar
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    Looks like any of the many lists you can find through Google
    http://webopedia.internet.com/quick_ref/IRQnumbers.asp
    http://en.wikipedia.org/wiki/Input/Output_Base_Address

    While many are standardized..there's a flexibility in some of them also.

    Back in the Win9X days..used to sometimes get pretty tight when you had lots of peripherals. Pretty much don't have to deal with any of these anymore with todays newer systems..as WinNT is much better at IRQ sharing..and the limitations of the old AT motherboards are gone since APIC types came out.
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  5. #5
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    YOSC, Is it best to memorize these lists for taking comptia A+ tests soon> Thanks for your help.

  6. #6
    Moderator YeOldeStonecat's Avatar
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    Quote Originally Posted by 24giovanni
    YOSC, Is it best to memorize these lists for taking comptia A+ tests soon> Thanks for your help.
    Back when I took it..yes they did ask you a few of them (I think I remember IRQ for IDE, and I/O for COMs). But the tests were different back then....Yard of Stuff recently took them...he could answer more accurately.
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  7. #7
    Second Most EVIL YARDofSTUF's Avatar
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    Ok dug up my A+ Hardware book, It lists them as this:

    IRQ - I/O - Device:
    0 - 0040-005F - System Timer
    1 - 0060-006F - Keyboard Controller
    2 - 00A0-00AF - Access to IRQs 7 and above
    3 - 02F8-02FF - COM2
    3 - 02E8-02EF - COM4
    4 - 03F8-03FF - COM1
    4 - 03E8-03EF - COM3
    5 - 0278-027F - Sound Card or LPT2
    6 - 03F0-03F7 - Floppy Controller
    7 - 0378-037F - LPT1
    8 - 0070-007F - Real Time Clock
    9-10 - blank - available
    11 - blank - SCSI or available
    12 - 0238-023F - Motherboard Mouse
    13 - 00F8-00FF - Math Coprocessor
    14 - 01F0-01F7 - IDE hard drive
    15 - 0170-017F - Secondary IDE or available


    And IRQ priority:

    0, 1, (8, 9, 10, 11, 12, 13, 14, 15), 3, 4, 5, 6, 7

  8. #8
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    thanks YOS

  9. #9
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    YOS, when you took the test did it ask for the i/o address or did the test ask for ranges? tks

  10. #10
    Second Most EVIL YARDofSTUF's Avatar
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    It asked for the address, but I was lucky and only got 2 or 3 questions on it, I just guessed lol

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