S y s t e m B I O S a n d S e t u p
B/12
LS/VS 550
OWNER’S HANDBOOK
ROM Shadowing
To shadow ROM means to copy its contents into the computer’s
system or random-access memory (RAM). This is beneficial for two
reasons: ROM has (relatively) long access times and the processor
can access RAM faster than ROM; second, the contents of RAM
can be cached for even greater performance. All of the computer’s
system BIOS ROM is shadowed.
The ROM Shadowing option allows you to shadow video BIOS
and up to three 32 Kbytes areas of expansion card ROM (that is,
ROM fitted on ISA or PCI expansion cards) addressed between
C8000h and EFFFFh.
See the chapter entitled, “Expansion Cards” for more information
about addressing expansion card ROM.
Note that the two 32 Kbytes areas from E0000h to E7FFFh and
E8000h to EFFFFh cannot be shadowed independently of the
system BIOS ROM.
Caution
Caution
Shadowing is only appropriate for expansion card ROM. It must not be
enabled for expansion card RAM.
PCI Options
The only configurable PCI option is Palette Snooping, which can
be “Enabled” or “Disabled”, it should be enabled only for PCI video
expansion cards that require it.
Universal Serial bus (USB)
This is available for future use with USB compatible peripherals and
is set to ‘enabled’.
Plug and Play
You can either enable or disable the Plug and Play adapter
configuration. Enabling the Plug and Play adapter configuration
will auto-configure any Plug and Play cards but any ISA adapters
