Dell Precision 330 - Manual (Page 173)

Solving Problems 173
Program Conflicts
Some programs may leave portions of their setup information behind, even
though you have exited from them. As a result, other programs cannot run.
Rebooting your system can confirm whether these programs are causing the
problem.
Memory Address Conflicts
Memory address conflicts occur when two or more devices try to access the
same address in the upper memory blocks (UMB). For example, if a network
expansion card and an expanded-memory page frame are assigned an
overlapping block of addresses, a memory address conflict arises. As a result,
when you try to log in to the network, the operation fails.
To resolve this type of conflict, you can change the address of one of the
devices. For example, in the case of the network expansion card and
expanded-memory page-frame address conflict, you can move the network
card to an address block in the range of CC000h through D0000h. To
reassign the expansion card's address block, refer to the documentation for
the card.
Interrupt Assignment Conflicts
Problems can arise if two devices attempt to use the same interrupt request
(IRQ) line. To avoid this type of conflict, check the documentation for the
default IRQ-line setting for each installed expansion card. Then consult the
following table to configure the card for one of the available IRQ lines.
NOTE: The following table lists default IRQ settings. In systems with Plug and
Play capabilities, you can modify the defaults. If you install a Plug and Play
card in a Plug and Play computer, the computer automatically selects an open
IRQ line if any are available.
D e f a u l t I R Q L i n e A s s i g n m e n t s
IRQ Line Used/Available
IRQ0 Used by the system timer
IRQ1 Used by the keyboard to signal that the output buffer is full
IRQ2 Used by interrupt controller 1 to enable IRQ8 through IRQ15