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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0001:  Power Supplies - System Board
      9  XII  Plug and Play

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Why Plug ’n Play is Sometimes Plug and Pray
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 XIII  AGP
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PCI Steering

Assuming a modern system board, beginning with Windows 95B (not Windows 95 Release 4.00) a new feature called PCI steering was introduced. For example: An ISA sound card uses IRQ 9. You install a PCI card that would like to use IRQ 9.

PCI Steering will:

  • Disable the ISA sound card.

  • Reprogram to available IRQ (example IRQ 10) to be an ISA IRQ.

  • Move the Sound card to IRQ 10.

  • Assign an IRQ Holder to 9.

  • Reprogram IRQ 9 to be a PCI IRQ.

  • Install the PCI device to IRQ 9.

The only challenge with PCI Steering is if one device goes haywire, the whole scheme falls apart like a house of cards.

IRQ Steering

IRQ Steering only works on PCI, not ISA.


This leads us to another expansion bus, once again, brought to us by Intel.


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 XIII  AGP
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