VIA Mainboard 845G Series Manual page 32

Managing The PC BIOS
DRAM RAS# Precharge
If the DRAM is not continually refreshed it's data will be lost. DRAM is normally
refreshed as a result of a single request. This field lets you select the number
of CLKs allocate for the RAS to accumulate its charge before the DRAM is re-
freshed. If there is not sufficient time then the refresh may be incomplete and
some of the data can be lost.
Memory Frequency For
This field allows you to manually select the frequency of the memory modules
you are using. This mainboard supports both DDR200 and DDR266 DDR mod-
ules. If you do not know what the frequency of your memory modules is then
select auto and the system will automatically decide.
System BIOS\ Video BIOS Cacheable
These fields enable (disable) the caching of the System BIOS and the Video
BIOS. The Sysem BIOS is cached at F0000h-FFFFFh, and the Video BIOS is
cached at C0000h-C7FFFh, Both System and Video BIOS are cached via the L2
cache. If these options are enabled, access to the system BIOS may speed up
BUT if any other program tries to write to the memory locations specified
above then the system will crash. We recommend that you disable these op-
tions. Note The System/Video BIOS can only be cached when the System
BIOS/Video BIOS has been shadowed.
AGP Aperture Size
This field selects the size of the Accelerated Graphics Port (AGP) aperture. The
aperture is a portion of the PCI memory address range dedicated for graphics
memory address space. Host cycles that hit the aperture range are forwarded
to the AGP without any translation. The default is 64MB. You may increase this
memory when you need to have faster access for 3D graphics applications (e.
g. games).
Turbo Mode (only for 845G-MWT)
To initialize the on-chip VGA display to turbo mode.
Boot Display (only for 845G-MWT)
This field allows you to manually select the output display device, such as CRT
Monitor, TV or EFP Panel.
Page 32 The 845G MAINBOARD Series