Apricot XEN Pentium 60, Руководство пользователя

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A/12 XEN OWNER'S HANDBOOK
Inside the Apricot XEN
Appendix A
On the XEN 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.
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.
This will leave the maximum amount of memory free for use as
UMB space. For information on UMB space refer to your DOS
documentation, and the help files supplied with your computer.
I/O ports I/O ports are used by the processor to control the operation
of peripherals. Some expansion cards are controlled via an I/O
port or group of ports.
Which port or ports the card uses can normally be selected on
the card. The following table lists the I/O ports used by the XEN
motherboard. Any ports not listed below may be used by an
expansion card. Refer to the table, and the documentation
supplied with the card to establish which ports, if any, to use
and how to select them.