TYAN TOMCAT IVS D Manual page 50

w System BIOS Cacheable
If this option is enabled, the F000 segment of the BIOS shadow will be
cached. The default is enabled.
w Adaptor ROM Shadow C000 to DC00
The adaptor ROMs present on the system may either execute
out of ROM(disabled), RAM(Shadow), or execute out of RAM and
be cached(Cache). The adaptor ROM area should be left disabled
unless the device in that region can support shadowing (Its ROM being
copied to RAM for better performance). The default is disabled.
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