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77 Chapter 10
Gate A20 Option
Gate A20 refers to the way the system addresses memory above 1 MB
(extended memory). When set to Fast, the system chipset controls Gate
A20. When set to Normal, a pin in the keyboard controller controls Gate
A20. Setting Gate A20 to Fast improves system speed, particularly with
OS/2 and Windows.
Typematic Rate Setting
When Disabled, the following two items (Typematic Rate and Typematic
Delay) are irrelevant. Keystroke repeats at a rate determined by the key-
board controller in your system. When Enabled, you can select a type-
matic rate and typematic delay.
Typematic Rate (Chars / Sec)
When the typematic rate setting is enabled, you can select a typematic
rate (the rate at which character repeats when you hold down a key) of 6,
8, 10, 12, 15, 20, 24, or 30 characters per second.
Typematic Delay (Msec)
Choices: 250; 500; 750; 1000. This option sets the time interval for dis-
playing the first and the second characters. If enabled, the time interval is
optional.
Security Option
If you have set a password, select whether the password is required every
time the System boots, or only when you enter setup. The choices: sys-
tem; setup.
PS/2 Mouse Function
Disabled: Prevents any installed PS/2 mouse from functioning but free up
occupied IRQ.
Enabled: Allows the operating system to determine whether to enable or
disable the mouse.
OS Select For DRAM > 64MB
Select OS2 only if you are running OS/2 operating system with greater
than 64MB of RAM on your system.
Reports No FDD For Win95
Video BIOS Shadow
Performance will be improved by copying Video BIOS to Shadow RAM.