Siemens Simatic PG 740 - Page 75

5
5-10
Programming Device PG 740
C79000-G7076-C742-01
The following submenu appears when you select the option “Memory
shadow” in the main menu:
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 ExitAdvanced
Memory Shadow
Enabled
Video BIOS may be copied to
shadow RAM for increased
performance.
Figure 5-5 “Memory Shadow” Submenu
Parts of the EPROM, for example, those which contain the power-on selftests
and the basic input/output system, are copied into the faster DRAM (shadow
memory).
System Shadow always indicates “Enabled” since the system BIOS is always
copied into the faster RAM.
ÁÁÁÁÁÁ
Á
ÁÁÁÁ
Á
Video Shadow
enabled
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
The BIOS expansion for display outputs is copied into the RAM
ÁÁÁÁÁÁ
Á
ÁÁÁÁ
Á
ÁÁÁÁÁÁ
Video Shadow
disabled
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
The BIOS expansion for display outputs is not copied into the
RAM
The Video Shadow setting is only effective if an external VGA interface
module is used.
“Memory Shadow”
Option
Configuring the PG 740