Diamond Systems HERCULES-EBX HRC400-5A128, Руководство пользователя, Страница: 46 / 123

Hercules-EBX CPU User Manual V1.02 Page 46
Miscellaneous
-Memory Cache Settings:
Unless there is a specific reason to change these settings, it is best to keep these settings as-is.
Certain system functions (such as USB keyboard support under BIOS menus) may be adversely
affected by changes to these settings, due mainly to a heavy reduction in performance. These
cache settings can make a huge difference for low-level BIOS calls and, as such, can severely
limit performance if they are disabled.
-On the Advanced Chipset Control screen, the following settings should be retained:
Frame Buffer Size: 8MB
AGP Rate: 4X
Expansion Bus Performance: Normal
The Frame Buffer size can be increased for specific applications; just be aware that an increase
in this memory size will result in a decrease in overall system memory available. The AGP rate
affects internal video accesses and does not affect any external bus speeds.
“Expansion Bus Performance” is an adjustment to allow an increase in ISA I/O Access speeds.
For applications where ISA I/O accesses seem to be a limiting factor, this performance may be
increased to “Accelerated”. Be aware that increasing these timings may adversely affect system
stability with external add-on PC/104 cards. This setting has no direct affect on PCI or memory
speeds; it only affects ISA PC/104 devices. It is best to leave this setting at “Normal” if there are
no ISA I/O Performance issues.
-On the Advanced screen, the following settings should be retained:
Installed O/S Win98
Large Disk Access Mode DOS
-On the On-Chip Multifunction Device screen, the following settings should be retained:
USB Device Enabled
Legacy Audio Disabled
“Legacy Audio” will only affect DOS-based applications when used with the VIA-supported
DOS Drivers. Enabling this setting will require system I/O, IRQ, and DMA resources. It is
strongly recommended that this setting be left “Disabled.”
-On the PCI and ISA Configuration pages (from the Advanced screen), the following setting
should be retained:
PCI IRQ Level 1-4 Autoselect for all
PCI/PNP ISA UMB Region Exclusion Available for all
-The Power Management Screen will only be in effect when under DOS. Otherwise, the OS
power management settings will pre-empt these settings. The only power management mode
supported by the system is “Power-On Suspend” – other suspend modes are not supported and
should not be used under any OS (Examples of unsupported suspend modes: “Hibernate” under
Windows and “Suspend-to-Disk” or “Suspend-to-RAM”.)
- The Memory Shadow page of BIOS options should not be modified unless you are certain what
you are doing. These settings can adversely affect system performance and, potentially, system
reliability.