I'm having pretty much the same problem that GrizzlyAddams was having in 
this thread.  
Here's what I know - 
- I built this breakout cable.  I can get the picture VERY close to stable on the monitor, but it continues to scroll.  (the monitor is placed horizontally so the monitor keeps rolling up or down.  I can stabilize it in the middle of the screen.  It runs my Road Blasters fine on it.
- I have another monitor which seems more modern and seems to be called (at least it says on the board) a Videomaster 13.  with a Samsung picture tube.  The breakout cable works fine to this monitor.  
- I'm getting the same results with dmame/arcadeos & advancemenu/advancemame.
so my question is I guess...do I need to change something in the config of these apps to tell them to output to my monitor in a different way (the same way the Road Blaster - Atari System 1 board?)?
I've read up quite a bit on this and I get the feeling that I'm just an idiot.  I've put off asking this question for about 2 weeks.  I can't take it anymore.  Anyone have any ideas?
Thanks
Allroy