The 845D-AV MAINBOARD
Ver 3.x
Page 30
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 modules. If
you run the FSB at 533MHz the only default option for this filed is DDR266, or
if the FSB is at 400MHz the option for this filed can be AUTO, DDR266 or
DDR200. 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 \Video RAM Cacheable
These fields enable (disable) the caching of the System BIOS , the Video
BIOS and the Video RAM. The Sysem BIOS is cached at F0000h-FFFFFh, the
Video BIOS is cached at C0000h-C7FFFh, and the Video RAM is cached at
A0000h-AFFFFh. All three 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 options. Note The System/Video
BIOS can only be cached when the System BIOS/Video BIOS has been shad-
owed.
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).
Managing The PC BIOS
0*+#(!6
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On-Chip Primary PCI IDE/On-Chip Secondary PCI IDE
These two options (option 1 and option 6) allows you to enable or disable the
onboard IDE Interface.
Primary/Secondary, Master/Slave PIO
The four IDE PIO (Programmed Input/Output) fields let you set a PIO mode
(0-4) for each of the four IDE devices that the onboard IDE interface supports.
Modes 0 through 4 provide successively increased performance. In Auto mode,
the system automatically determines the best mode for each device.
Primary/Secondary, Master/Slave UDMA
Ultra DMA/66 implementation is possible only if your IDE hard drive supports it
and the operating environment includes a DMA driver (Windows 98 OSR2 or a
third-party IDE bus master driver). If your hard drive and your system
software both support Ultra DMA/66, select Auto to enable BIOS support.
USB Controller
This field allows you to enable or disable the onboard USB Controller.