The 845PE-ANT MAINBOARD
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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.
Memory Hole At 15M-16M
Some old add-in cards need this enabled to work properly. If you have such a
card then enable this, otherwise disable it.
Delayed Transaction
The chipset has an embedded 32-bit posted write buffer to support delay
transactions cycles. Select Enabled to support compliance with PCI
specification version 2.1.
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
4*+(
This menu is on next page)
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.
USB 2.0 Controller
This field allows you to enable or disable the onboard USB 2.0 Controller.
