Digital Equipment DIGITAL Server 7100 1200, Service Maintenance Manual, Page: 41 / 162

SCU Features
3-8
Shadow Options Group
Menu Fields Settings Comments
Shadow video
BIOS ROM Enabled
(1)
Disabled
The main logic board reserves an area of DRAM for a
copy of video BIOS ROM. This DRAM called
“shadow memory” is write-protected and has the
same addresses as the video BIOS ROM locations.
When you shadow video BIOS ROM, the ROM image
is copied into an appropriate area in DRAM. This
increases the server’s performance because the
video BIOS instructions are in fast DRAM instead of
low speed ROM. For PCI VGA devices, video BIOS
is always shadowed in C0000h-C7FFFh, regardless
of this field’s setting.
Shadow C8000h-
CBFFFh Disabled
(1)
Enabled
Allows you to disable or enable the shadowing
request for optional ROM at the corresponding
addresses.
Shadow CC00h-
CFFFFh Disabled
(1)
Enabled
Allows you to disable or enable the shadowing
request for optional ROM at the corresponding
addresses.
Shadow D0000h-
D3FFFh Disabled
(1)
Enabled
Allows you to disable or enable the shadowing
request for optional ROM at the corresponding
addresses.
Shadow D4000h-
D7FFFh Disabled
(1)
Enabled
Allows you to disable or enable the shadowing
request for optional ROM at the corresponding
addresses.
Shadow D8000h-
DBFFFh Disabled
(1)
Enabled
Allows you to disable or enable the shadowing
request for optional ROM at the corresponding
addresses.
Shadow DC000h-
DFFFFh Disabled
(1)
Enabled
Allows you to disable or enable the shadowing
request for optional ROM at the corresponding
addresses.
(1)
Factory default setting