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SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01
When you call up the menu option Memory Shadow in the main menu, the
following submenu appears:
PhoenixBIOS Setup-Copyright 1985-95 Phoenix Technologies Ltd.
Item Specific Help
F1
ESC
Help
Exit
Select Item
Select Menu
+ / –
Enter Select
Change Values
F9
F10
Setup Defaults
Previous Values
Sub-Menu
System shadow:
Video shadow:
[Enabled]
Main
Security
Power
Exit
Advanced
Memory Shadow
Enabled
Video BIOS may be copied to
shadow RAM for increased per-
formance.
Figure 2-17 Submenu “Memory Shadow”
Some parts of the EPROM; for example, those which contain
PowerOnSelfTests and the BasicInOutputSystem are copied into the dRAM
memory (shadow memory) providing faster access. System shadow is always
enabled because the system BIOS is always copied into the faster RAM.
Video shadow enabled
copies the BIOS expansion for display in the RAM
Video shadow disabled
does not copy the BIOS expansion for display in the RAM
These settings are only valid if an extended VGA graphics interface is used.
Memory Shadow
Motherboard