IBM 2193, 6345, 2194 manual Gate A20 Option, Typematic Rate Setting, Typematic Rate Chars/Sec

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.

Normal	keyboard
Fast	chipset

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.

Enabled	Enable typematic rate (repeat)
Disabled	Disable typematic rate (no repeat)

Typematic Rate (Chars/Sec)

When the typematic rate is enabled, you can select the rate at which the keys are repeated.

6

8

10

12

15

20

24

30

6 characters per second

8 characters per second

10 characters per second

12 characters per second

15 characters per second

20 characters per second

24 characters per second

30 characters per second

6-14IBM Personal Computer User Guide