American Megatrends 87 Series, User Manual

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Chapter 5 AMIBIOS Setup
72
ADVANCED CMOS SETUP Options,
Continued
System ROM Shadow F000,64K
This option controls the shadowing and caching of the contents of shadowed system BIOS ROM. In ROM
shadowing, BIOS code is copied from slower ROM to faster RAM. The BIOS is then executed from the
RAM. This option permits the contents of memory locations F0000h – FFFFFh to be copied from ROM to
RAM for quicker execution and controls whether these contents can be written to or read from cache
memory. The settings are:
Setting Description
Shadowed
(the BIOS Setup
and Power-On
default)
The contents of video ROM are copied to RAM but cannot be
stored in cache memory.
Cached The contents of video ROM are copied to RAM and can be
stored in cache memory.
You must be reasonably certain that
no application will write to video ROM memory area while
this option is enabled.
Shadow RAM Write Protection
When enabled, this option makes sure that Adaptor ROM code that resides in ROM and has been shadowed
to RAM cannot be overwritten. This option should usually be enabled. However, this option may have to be
disabled in some adapter cards if Adaptor ROM is shadowed to RAM. Or Adaptor ROM shadowing could
be disabled to help these adapter cards work. The settings are
Enabled or Disabled. The BIOS Setup and
Power-On defaults are Enabled.