I've got a machine here with a motherboard that apparently has two 
names.  It is known as a "Arima RioWorks HDAMA" 
(http://www.rioworks.com/HDAMA.htm) and also as a "Accelertech AT02161" 
(http://www.accelertech.com/products/motherboard/ATO2161.php).  There 
seems to be an issue getting the board to read these install .isos.  
here's a thread from a guy who was having exactly the same problem as I 
am having now 
(http://mail-index.netbsd.org/port-amd64/2003/11/16/0000.html)

Every suggestion listed here is something I have already attempted so 
I'm wondering if anyone has knowledge of a specific fix.  
Alternatively, there were references made to doing a netboot install.  
This is something I would like to know how to do but I can't find any 
specific information on how to perform an amd64 netboot install.

Can anyone give me some pointers in either direction?

Thanks in advance...