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34
Chapter 2
Memory Hole at 15M-16M
Certain ISA cards require exclusive access to the 1MB
block of memory, from the 15th to the 16th megabyte, to
work properly. This BIOS feature allows you to reserve that
1MB block of memory for such cards to use.
If you enable this feature, 1MB of memory (the 15th MB)
will be reserved exclusively for the ISA card's use. This
effectively reduces the total amount of memory available to
the operating system by 1MB.
Please note that in certain motherboards, enabling this
feature may actually render all memory above the 15th MB
unavailable to the operating system!
If you disable this feature, the 15th MB of RAM will not be
reserved for the ISA card's use. The full range of memory is
therefore available for the operating system to use.
However, if your ISA card requires the use of that memory
area, it may then fail to work.
Since ISA cards are a thing of the past, it is highly
recommended that you disable this feature. Even if you
have an ISA card that you absolutely have to use, you may
not actually need to enable this feature.
Most ISA cards do not need exclusive access to this
memory area. Make sure that your ISA card requires this
memory area before enabling this feature. You should use
this BIOS feature only in a last-ditch attempt to get a
stubborn ISA card to work.
Enabled
Disabled
PCI Express Root Port Func Press [Enter] to enter the sub menu to select PCI Express
Root Port Function
Use
wx
to
select a device,
then press<+> to
move it up, or < -
> to move it down
the list.
Parameter
Description
Options