Mainboard User’s Manual
Fast R-W Turn
Around
When this is enabled, the chipset will insert one
extra clock to the turn-around of back-to-back
DRAM cycles.
System BIOS
Cacheable
When enabled, the System BIOS will be cached
for faster execution.
Video RAM
Cacheable
When enabled, the graphics card’s local memory
will be cached for faster execution. However, if
any program writes to this memory area, a system
error may result.
OnChip AGP VGA
This item allows the user to select the type of VGA
used.
Frame Buffer Size
This option determines the frame buffer size
shared from the main memory for use by the
onboard VGA display.
AGP Aperture Size
This option determines the effective size of the
AGP Graphic
Aperture
, where memory-mapped
graphic data structures are located.
AGP 4X Mode
This item allows you to enable or disable the
caching of display data for the video memory of
the processor. Enabling can greatly improve the
display speed. If your graphics display card does
not support this feature, you need to disable this
item.
AGP Driving
Control
This item can be used to signal driving current on
AGP cards to auto or Manual. Some AGP cards
need stronger than normal driving current in order
to operate. We recommend that you set this item
to Auto by default.
AGP Driving Value
When the previous item AGP Driving Control is set
to Manual, you can use this item to set the AGP
current driving value.
OnChip USB
This item allows you to enable the USB port, if you
have installed a USB device on the system board.
USB Keyboard
Support
Enables function when the USB keyboard is being
used. Disabled (default) when an AT keyboard is
used.
OnChip Sound
Disabling this function turns off the onboard audio
chip.
CPU to PCI Write
Buffer
When enabled, up to four words of data can be
written to the PCI bus without interrupting the
CPU. When disabled, a write buffer is not used
and the CPU read cycle will not be completed until
the PCI bus signals that it is ready to receive the
data. The default setting is Enabled.
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Summary of Contents for VT82C686A
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