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Gate A20 Option
This field 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. A20 refers to the
first 64KB of extended memory.
Fast
Normal
Typematic Rate Setting
Disabled
Enabled
Typematic Rate (Chars/Sec)
This field allows you to select the rate at which the keys are
accelerated.
Typematic Delay (Msec)
This field allows you to select the delay between when the key was
first depressed and when the acceleration begins.
The chipset controls Gate A20.
A pin in the keyboard controller controls Gate
A20.
Continually holding down a key on your
keyboard will cause the BIOS to report that the
key is down.
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
BIOS Setup
5 7
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