Nexcom EBC575 Series Manual page 39

Gate A20 Option
Gate A20 refers to the way the system addresses memory above 1MB (extended memory). This feature
enables you to select whether the chipset or the keyboard controller should control Gate A20. The options
are:
Normal: A pin in the keyboard controller controls Gate A20
Fast: Let system chipsets control Gate A20. The fast setting improves system speed, particularly with
OS/2 and windows.
Typematic Rate Setting
If set to Enabled, enables you to set the Typematic Rate and Typematic Delay. When Disabled, the following
two items (Typematic Rate and Typematic Delay) are irrelevant. Keystroke repeats at a rate determined by
the keyboard controller in your system.
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): This setting controls the time between the display of the first character and
successive characters. There are four delay choices: 250ms, 500ms, 750ms and 1000ms.
Security Option
Enables you to select whether the password is required every time the system boots or only when you enter
Setup.
System: The system will not boot and access to Setup will be denied if the correct password is not
entered at the prompt.
Setup: The system will boot, but access to Setup will be denied if the correct password is not entered
at setup.
APIC Mode
The APIC Mode BIOS feature is used to enable or disable the motherboard's APIC (Advanced Program-
mable Interrupt Controller). If your single-processor motherboard supports APIC and you are using a Win32
operating system (Windows NT, 2000 and XP), it's recommended that you enable this feature to allow faster
and better IRQ handling. If you are using a multiprocessor motherboard, you must enable this feature be-
cause it's required for IRQ handling in multiprocessor systems.
MPS Version Control for OS
This feature is only applicable to multiprocessor motherboards as it specifies the version of the Multi-Proces-
sor Specification (MPS) that the motherboard will use. The MPS is a specification by which PC manufactur-
ers design and build Intel architecture systems with two or more processors.
MPS version 1.4 is required for a motherboard to support a bridgeless secondary PCI bus.
OS Select for DRAM>64MB
Set to OS2 if the system memory size is greater than 64 MB and the operating system is OS/2, otherwise
select Non-OS2 option.
EBC575 User's Manual 39 Chapter 4