Dell Precision 410 User Manual page 53

NOTE: The Usr1 and Usr2 drive types can be used for both the Primary and Second-
ary Drive 0 and Drive 1 options. However, if you select the Usr1 or Usr2 drive type,
you may not obtain optimum hard-disk drive performance. Also, the Usr1 and Usr2
drive types cannot be used for hard-disk drives greater than 528 megabytes (MB) in
capacity.
Reserved Memory allows you to designate a region of system board memory that
can be supplied by an expansion card. You should not enable the reserved memory
feature unless you are using an expansion card that requires special addressing.
For example, you may have a memory expansion card that needs to be addressed
starting at 15 MB. Selecting 15M-16M for Reserved Memory specifies that only part
of the base memory comes from the dual in-line memory modules (DIMMs) on the
system board, whereas the base memory from 15 MB to 16 MB comes from the
memory expansion card.
Reserved Memory has the following settings:
None (the default)
15M–16M
512K–640K
CPU Speed indicates the processor speed at which your system boots.
Press the left- or right-arrow key to toggle CPU Speed between the processor's rated
speed (the default) and a lower compatibility speed, which lets you accommodate
speed-sensitive application programs.
Num Lock determines whether your system boots with the Num Lock mode activated
on 101- or 102-key keyboards.
When Num Lock mode is activated, the rightmost bank of keys on your keyboard pro-
vides the mathematical and numeric functions shown at the tops of the keys. When
Num Lock mode is turned off, each key provides the cursor-control function (if any)
indicated at the bottom of the key.
ACPI controls the Advanced Configuration and Power Interface. If the operating sys-
tem supports ACPI and ACPI is toggled On, pressing the power button momentarily
places the system in a power-saving mode. You can turn the system completely off by
pressing and holding the power button for more than 4 seconds. When ACPI is acti-
vated (On), IRQ 9 is not available for use by expansion cards.
Using the System Setup Program 3-9