
2 System Board
Devices on the PCI Bus
Devices on the PCI Bus
PCI Device | Device  | Device  | Function  | 
  | AD[xx]  | ||||
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Name | Number | 
  | INTA  | INTB  | INTC  | INTD  | |||
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PL/PCI bridge  | 440LX PAC  | 0  | N/A  | 11  | —  | —  | —  | —  | |
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  | |
Virtual   | 440LX PAC  | 1  | N/A  | 12  | —  | —  | —  | —  | |
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  | |
PCI/ISA bridge  | PIIX4  | 4  | 0  | 15  | —  | —  | —  | —  | |
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IDE controller  | 
  | 
  | 1  | 
  | 
  | —  | —  | —  | —  | 
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USB Host controller  | 
  | 
  | 2  | 
  | 
  | —  | —  | —  | —  | 
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Power Management and SM Bus  | 
  | 
  | 3  | 
  | 
  | —  | —  | —  | —  | 
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  | 
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  | |
PCI slot #1 (LAN) - Minitower  | 16  | 7  | 18  | A  | B  | C  | D  | ||
Backplane Rear Board - Desktop  | 
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PCI slot #2 - Minitower  | 17  | 10  | 21  | D  | A  | B  | C  | ||
PCI slot #1 - Desktop  | 
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PCI slot #3 - Minitower  | 18  | 6  | 17  | C  | D  | A  | B  | ||
PCI slot #2 - Desktop  | 
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PCI slot #4 - Minitower  | 19  | 12  | 23  | B  | C  | D  | A  | ||
PCI slot #3 - Desktop  | 
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The distribution of the interrupt lines is described more fully on page 83.
Integrated Drive Electronics (IDE)
The IDE controller is implemented as part of the PIIX4 chip (the PCI/ISA bridge). It is driven from the PCI bus, and has 
The IDE controller supports two devices (one master and one slave) connected to a single channel. The channel is fitted with an IDE cable with two connectors.
39