Forgot to mention that this is basically a problem
with the host.con
 file.  If you go to the links I provided, it will tell you how to change
 it to work off of the regular monitor.  I suspect it is configured to
 run X instead.  You can use a regular RGB to VGA adapter which is what
 most people do. 
Thanks for the helpfull hints.
I "hot wired" an adapter for a DB-15 to a LCD panel which does RGB with
sync on green, and the system came up perfectly (Nice screen full of
Atari logos in the startup).
Couldn't find a SHUTDOWN or HALTSYS command ('STOP' produces the
encouraging message 'So far unimplimented') ... but entering ^D to the
X-console causes a flurry of disk activity terminating with what "could be
the sound of a head park"... and returns control to the Mega/GEM desktop
on the Atari monitor - is this the correct procedure to shut down Helios?
Very cool system!
Regards,
Dave
--
dave04a (at)    Dave Dunfield
dunfield (dot)  Firmware development services & tools: 
www.dunfield.com
com             Collector of vintage computing equipment:
                
http://www.parse.com/~ddunfield/museum/index.html