Dell Dimension XPS D Series Reference And Troubleshooting Manual page 151

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Memory Displays the Memory Reservation submenu, where you can
Reservation set the following options:
xxxx – xxxx Reserves the specified UMB (for example C800–CBFF) for
use by legacy ISA devices. Settings are Available (default)
and Reserved.
Memory Hole Settings are Disabled (default), Conventional, and Extended.
Conventional turns system RAM off to free a 128-KB space,
starting at 512 KB, for use with an expansion card. Extended
frees a 1-MB space, starting at 15 MB.
IRQ Reservation Displays the IRQ Reservation submenu, where you can set
the following options:
IRQ n Reserves the specified IRQ for use by legacy ISA devices.
Settings are Available (default) and Reserved.
NOTE: The Glossary in the Online Guide defines abbreviations and acronyms.
System Setup Program B-9