Dell OptiPlex GX50, Руководство пользователя

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206 Solving Problems
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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 computers
with Plug and Play
capabilities, you can
modify the default
settings. 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.
Default IRQ Line Assignments
IRQ
Line Used/Available
IRQ0 Used by the computer 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
IRQ3 Used by serial port 2
IRQ4 Used by serial port 1
IRQ5 Available
IRQ6 Used by the floppy/tape drive controller
IRQ7 Used by the parallel port
IRQ8 Used by the real-time clock (RTC)
IRQ9 Used by the video graphics array (VGA) interface (optional)
IRQ10 Available