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IBM Personal Computer User Guide
Gate A20 Option
This entry allows you to select how the gate A20 is handled. The gate A20 is a
device used to address memory above 1 Mbytes. Initially, the gate A20 was
handled via a pin on the keyboard. Today, while keyboards still provide this support,
it is more common, and much faster, for the system chipset to provide support for
gate A20.
Typematic Rate Setting
This setting determines whether or not the typematic (repeat) function is enabled. If
the typematic function is enabled and a key is held down, the key will repeat after a
brief delay. If the typematic function is disabled, the key will not repeat when held
down.
Typematic Rate (Chars/Sec)
When the typematic rate is enabled, you can select the rate at which the keys are
repeated.
Normal keyboard
Fast chipset
Enabled Enable typematic rate (repeat)
Disabled Disable typematic rate (no repeat)
6 6 characters per second
8 8 characters per second
10 10 characters per second
12 12 characters per second
15 15 characters per second
20 20 characters per second
24 24 characters per second
30 30 characters per second