Digital Equipment STARION 20 Series, Service Maintenance Manual

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Digital STARION 9xx & 20xx PC Utilities & Configuration
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Video BIOS
shadow Enabled
Disabled The main logic board reserves an area of DRAM, called "shadow
Memory", for a copy of video BIOS ROM. This DRAM is write-
protected and has the same addresses as the video BIOS ROM
locations. When video BIOS ROM is shadowed, the ROM
information is copied into an appropriate area in DRAM. This
increases the computer's performance because the video BIOS
instructions are in fast DRAM instead of ROM. For PCI VGA cards,
video BIOS is always shadowed, regardless of this field’s setting.