Intel System Board G4H875-N - Manual (Page 68)

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BIOS Setup
3.1.2.10 Gate A20 Option
This entry allows you to select how gate A20 is handled. Gate A20
is a device used to address memory above 1 Mbyte. Initially, gate A20
was handled via the keyboard controller. Today, while keyboards still
provide this support, it is more common, and much faster, for the
system chipset to provide support for gate A20.
Fast The chipset controls Gate A20.
Normal A pin in the keyboard controller controls Gate A20.
3.1.2.11 Typematic Rate Setting
Disabled Continually holding down a key on your keyboard will
cause the BIOS to report that the key is down.
Enabled The BIOS will not only report that the key is down,
but will first wait for a moment, and, if the key is still
down, it will begin to report that the key has been
depressed repeatedly. For example, you would use such
a feature to accelerate cursor movements with the
arrow keys. You can then select the typematic rate and
typematic delay in the “Typematic Rate (Chars/Sec)”
and “Typematic Delay (Msec)” fields below.
3.1.2.12 Typematic Rate (Chars/Sec)
This field allows you to select the rate at which the keys are
accelerated.
3.1.2.13 Typematic Delay (Msec)
This field allows you to select the delay between when the key was
first depressed and when the acceleration begins.