Jaton PowerPro VX, Руководство пользователя

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Chapter 3
28
Shadowing address ranges (C8000-CBFFF Shadow):
This option allows you to decide if the memory block (BIOS) of an interface card
at the address C8000-CBFFF uses the shadow feature or not. If you have no
interface card using this memory block, don
’
t enable this option.
Shadowing address ranges (CC000-CFFFF Shadow):
This option allows you to decide if the memory block (BIOS) of an interface card
at the address CC000-CFFFF uses the shadow feature or not. If you have no
interface card using this memory block, don
’
t enable this option.
Shadowing address ranges (D0000-D3FFF Shadow):
This option allows you to decide if the memory block (BIOS) of an interface card
at the address D0000-D3FFF uses the shadow feature or not. If you have no
interface card using this memory block, don
’
t enable this option.
Shadowing address ranges (D4000-D7FFF Shadow):
This option allows you to decide if the memory block (BIOS) of an interface card
at the address D4000-D7FFF uses the shadow feature or not. If you have no
interface card using this memory block, don
’
t enable this option.
Shadowing address ranges (D8000-DBFFF Shadow):
This option allows you to decide if the memory block (BIOS) of an interface card
at the address D8000-DBFFF uses the shadow feature or not. If you have no
interface card using this memory block, don
’
t enable this option.
Shadowing address ranges (DC000-DFFFF Shadow):
This option allows you to decide if the memory block (BIOS) of an interface card
at the address DC000-DFFFF uses the shadow feature or not. If you have no
interface card using this memory block, don
’
t enable this option.
SHADOW
The BIOS of standard video or other interface card is stored in ROM
on the card, which is often much slower than RAM. The VGA display
card usually use address B0000h to C7FFFh. With the Shadow
feature, the CPU reads the BIOS on the VGA card and copies it into
system RAM. When the CPU accesses the VGA BIOS for display, it
reads through RAM instead of ROM. Video shadow is often enabled
to speed up the display.