Siemens SIMATIC PC RI25/45 Technical Description page 62

Motherboard
Memory Shadow
When you call up the menu option Memory Shadow in the main menu, the
following submenu appears:
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
Video shadow disabled
These settings are only valid if an extended VGA graphics interface is used.
2-40
PhoenixBIOS Setup-Copyright 1985-95 Phoenix Technologies Ltd.
Main Advanced Security
Memory Shadow
Enabled
System shadow:
Video shadow: [Enabled]
F1 Help Select Item + / –
ESC Exit Select Menu Enter Select
copies the BIOS expansion for display in the RAM
does not copy the BIOS expansion for display in the RAM
Power Exit
Item Specific Help
Video BIOS may be copied to
shadow RAM for increased per-
formance.
Change Values F9 Setup Defaults
Sub-Menu F10 Previous Values
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01