Manual PCI-IIRO-8
10
Chapter 4: Address Selection
The card occupies four consecutive registers in I/O space.The PCI architecture is inherently plug-and-
play in nature. This means that the BIOS or Operating System determines the resources assigned to PCI
cards rather than you selecting those resources with switches or jumpers. As a result, you cannot set or
change the card's base address. You can only determine what the system has assigned.
To determine the base address that has been assigned, run the PCIFind.EXE utility program. This utility
will display a list of all of the cards detected on the PCI bus, the addresses assigned to each function on
each of the cards, and the respective IRQs and DMAs (if any) allotted.
Alternatively, some operating systems can be queried to determine which resources were assigned. In
these operating systems, you can use either PCIFind or the Device Manager utility from the System
Properties Applet of the control panel. The card is installed in the Data Acquisition class of the Device
Manager list. Selecting the card, clicking Properties, and then selecting the Resources Tab will display a
list of the resources allocated to the card.
The PCI bus supports 64K of address space, so your card's addresses may be located anywhere in the
0000 to FFFF hex range. PCIFind uses the Vendor ID and the Device ID to search for your card, then
reads the base address and IRQ assigned. If you want to determine the base address and IRQ assigned,
use the following information:
The Vendor ID code is 494F (ASCII for "I/O")
The device ID code is 0F00
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