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The region from 0 to 640k-1 (00000h to 9FFFFh) is used by
DOS. The operating system is loaded at the bottom of this
area and it uses the remainder to load applications and
data.
Motherboard video adapter memory is accessed between
640k and 768k-1 (A0000h to BFFFFh). In the XEN-LS II the
motherboard video BIOS is addressed between 768k and
800k-1 (C0000h to C7FFFh).
Note
This region is often used by video BIOS on expansion
cards. If an expansion card with video BIOS is installed in a
XEN-LS II the motherboard video BIOS is automatically
disabled.
The region from 800k to 896k-1 (C8000h to DFFFFh) is
available for expansion card ROM, other than video BIOS.
While address space from 896k to 1M-1 (E0000h to
FFFFFh) is used by the motherboard BIOS.
When installing expansion cards the area of most interest
is between 768k and 896k-1 (C0000h to DFFFFh).
Configuring expansion ROM
Expansion card ROM is addressed in the C0000h to
DFFFFh region of processor address space.
On the XEN-LS II motherboard video BIOS is accessed
from C0000h to C7FFFh. If you are installing a video card it
should be configured with its BIOS occupying this region.
The XEN-LS II will automatically detect the video card and
disable its motherboard video BIOS.
Note
If your video card does not allow you to configure the address
range of its BIOS it will be set to the C0000h range.
The region from C8000h to DFFFFh is available for
expansion card ROM other than video BIOS. It is
recommended that you configure expansion card ROM at
the bottom of this region, with the address ranges as close
together as possible without any overlapping.
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