The 845D-MVT MAINBOARD
Page 27
Typematic Rate Setting
The keyboard controller determines the rate at which the keystrokes from the
keyboard are repeated. If you enable this option then the typematic rate and
the typematic delay can be selected.
Typematic Rate
This is the rate a character will repeat itself on the screen when you hold down
a key.
Typematic Delay
This is the delay time (Msec) before the repetition of characters starts.
Security Option
This field allows you to select the “Setup” or “System” security option. It works
concurrently with the “ Set Supervisor Password” in the main menu.
When the "Setup" option is selected, you will be prompted to enter your
"Password" before you can start the BIOS CMOS Setup Utility. When you select
"System" option, you will be prompted to enter your password in order to load
the Operating System.
Managing The PC BIOS
OS Select For DRAM > 64MB
Only select OS2 if you are running an OS/2 operating system with a RAM
greater than 64 Mb. Otherwise, for all other operating systems, use the default
setting “Non-OS2”.
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DRAM Timing Selectable
This field determines the DRAM read/write timing. The performance parame-
ters of the memory chips (DRAM) you have installed will determine the value
in this field. Do not change the value from the factory setting unless you install
new memory that has a different performance rating than the original DRAMs.
CAS Latency Time
The time delay (in clock cycles, CLKS) that passes before the SDRAM starts to
carry out a read command after it has been received. The number of CLKs that
occur before the first part of a burst transfer is completed is also determined
by this field.
DRAM RAS# to CAS# Delay
When the DRAM is refreshed, both rows and columns are addressed sepa-
rately. This setup allows you to determine the timing of the transition from
Row Address Strobe (RAS) to Column Address Strobe (CAS).
