IBM RT PC Options Installation page 34

Adapter Conflicts
TNL SN20-9864 (May 1987) to 75X0217
The adapters you choose may conflict in memory address range, interrupt
level or DMA channel.
Conflicting Memory Addresses
When adapters conflict due to identical or overlapping memory addresses,
first try to resolve the conflict by changing address jumper modules on the
adapters.
If
this action does not resolve the conflict, ensure that applicable
software enables only one adapter at a time for memory address operations.
If
you are still unable to resolve the conflict, consult your place of purchase.
Conflicting Interrupt Levels.
The method of resolving interrupt level conflicts depends on whether the
interrupt level is required or optional. A required level cannot be reset, but
an optional level may be selected either by changing jumper module
positions on the adapter or through applicable software.
Required and optional interrupt levels may be shareable or nonshareable. A
shareable level may be used by more than one adapter on the same level
(but not at the same time). A nonshareable level may not be used by any
other adapter at any time.
Refer to the Interrupt and DMA Usage Chart on page 1-21 to plan your
system configuration.
Conflicting DMA Channels
DMA channel conflicts usually may be resolved by changing DMA jumper
modules on the applicable adapter. If the conflict cannot be resolved, one
of the conflicting adapters must be deleted from your system.
Refer to the Interrupt and DMA Usage Chart on page 1-21 to plan your
system configuration.
Section 1. Getting Started
1-19