System Cache; Boot Speed; Num Lock; Speaker - NEC POWERMATE PRO2180 Manual

System Cache

The default for the System Cache field is "Enabled." This
field controls both the primary and secondary caches.
Setting the system cache to "Disabled" will hurt
performance, but might be required when running software
which utilizes software timing loops and needs to be slowed
down to execute properly.

Boot Speed

Boot speed refers to the system CPU cycles. The default
boot speed is "Turbo." "De-turbo" mode slows the CPU by
disabling the system cache and adding increased refresh
cycles.
NOTE
8 MHz. If "De-turbo" is selected it will automatically
"Disable" the System Cache.

Num Lock

The Num Lock field turns controls whether the NumLock
key on the keyboard will be "On" or "Off" at bootup. The
default is "Off."

Speaker

The Speaker field allows you to turn the onboard speaker
(for multimedia systems) on or off. The options are
"Enabled" or "Disabled." The default for the Speaker field
is "Enabled."
"De-turbo" does not reduce the CPU speed to
NEC Drivers and Utilities 4-11