Video Bios Shadow; C8000 - Cbfff Shadow/Dc000 - Dffff Shadow - IBM CI5VGM Series User Manual

Chapter 3 BIOS Configuration

Video BIOS Shadow

This item allows you to change the Video BIOS location from ROM to
RAM. Video Shadow will increase the video speed.

C8000 - CBFFF Shadow/DC000 - DFFFF Shadow

Shadowing a ROM reduces the memory available between 640KB to
1024KB. These fields determine whether or not optional ROM will be
copied to RAM.
50 CI5VGM User's Manual