Dell OptiPlex G1 Reference And Installation Manual page 69

NOTE: After modifying the system configuration, you must turn off the system to
install, remove, or change jumper settings on the non-Plug and Play ISA expansion
cards to match the settings you selected in the ICU.
Before you remove a non-Plug and Play ISA expansion card from your computer, you
must use the ICU to remove the card from the system configuration.
NOTE: When you remove a Plug and Play or PCI expansion card from your computer,
you do not need to run the ICU. To remove a Plug and Play or PCI expansion card,
complete steps 2 through 9 in "Removing an Expansion Card" in Chapter 6.
To remove a non-Plug and Play ISA expansion card from your computer, follow these
steps:
The ICU requests verification that you want to remove the card.
The ICU returns to the ICU window.
See "Removing an Expansion Card" in Chapter 6 for instructions.
The ICU displays all resources currently used by your system.
To view all system resources, select System Resources from the View menu or click
View. The System Resource Usage dialog box (see Figure 3-10) displays all resources
currently used by the system.

Using the ISA Configuration Utility 3-13