PC-Xenix problem

[Thu Troung]

To Unix/Xenix experts,

This is my problem on the PC-Xenix i just installed a couple days ago.
I installed the Microsoft PC-Xenix on the 80286-10 Clone machine. My
machine configuration is:
       = DTK Mother board w/ 640K installed; one hard disk
         ST-225 hard drive; one 1.2Meg floppy drive; and
         two wyse-50 terminals attached to two COM port
         com1 and com2.

The problem was : I follows each step on how to install the operation
system software on to the hard disk. Everything went fine and it seemed
to work as expected. After the installation process finished, I typed
"haltsys" to shut down and then reboot the system in the hard drive.
It worked, but it trap the system abnormally and then display the
error message, something like:

        TRAP X0000 FE00
        0022 34340 FF06     ; memory dump here
        trap: in the system

        ***** press RETURN to reboot *****

I looked up in the manual the message "trap: in the system", It said
that the CPU generate some illegeal instruction -- irrcoverable.

I would like to know what wrong here ??? Is there anything that i
can fix ??? or is it the motherboard in not 100% compartible
with IBM-AT machine ???.

I will be appreciate for any help/suggestions you give to me. I am
really want the Xenix works on my machine. Any helps/suggestions
please e-mail directly to me at:

         thu at csufres.csufresno.EDU
         thu at csuf3b5.csufresno.EDU

Thanks in advanced 

Thu (Mike)