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MegaRUM PCI Motherboard User’s Guide58
Chipset Setup, Continued
PCI VGA USWC/Video Frame Buffer Set this option to Enabled to enable the USWC memory
attribute and improve video performance when a PCI video adapter is installed.
However, VGA card drivers may not behave correctly when this option is set to
Enabled. This option is only available if the PCI VGA card supports pre-
fetchable video frame buffers.
The settings are Disabled or Enabled. The Optimal and Fail-Safe defaults are
Disabled.
Optional ROM The MegaRUM motherboard has an empty option ROM socket. You can
install a 32 KB ROM in this socket. The starting memory address of this ROM
can be either C000h (only if this computer does not have a VGA controller),
C800h, D000h, or D800h. The following three Chipset Setup options
configure the option ROM only if you have installed a ROM chip in the
option ROM socket.
Optional ROM Decode This option specifies the starting address of an adapter ROM to be
decoded. The settings are C000h, C800h, D000h, D800h, or Disabled. The
Optimal and Fail-Safe defaults are Disabled.
Optional ROM Shadow Before Init Set this option to Enabled to permit the contents of the
option ROM to be copied to RAM before being initialized by AMIBIOS during
Power On Self Test. This option does not appear if the Optional ROM Decode
option is set to Disabled. The settings are Disabled or Enabled. The Optimal
and Fail-Safe default settings are Disabled.
Optional ROM Cacheable Set this option to Enabled to allow the contents of the option ROM
to be read from or written to cache memory. This option does not appear if the
Optional ROM Shadow Before Init option is set to Disabled. The settings are
Enabled or Disabled. The Optimal and Fail-Safe default settings are Disabled.
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