Does anyone know of a source for documentation on this monitor, it was popular   
   on C128 systems. Ideally owners manual and service/schematics.   
      
   In Europe the C1901 was similar but I have the US model which has a 4 position   
   mode selector on the front labelled 1,2,3,4.   
      
   I've found conflicting info googling   
      
   http://ns2.ubbcentral.com/store/item/Vintage-Thomson-4120-Color-   
   RT-Monitor--Cables---Works-on-Commodore-Amiga_221874422872.html "There is a   
   4-way switch on the front 1 is for RGB, and 4 is for composite,2 and 3 work   
   with the Luma/Chroma inputs."   
      
   https://groups.google.com/forum/m/#!topic/comp.sys.cbm/7NpZt2q8WPs "It's got a   
   four-way switch on the base, for 40 Columns, 80 Col. Monochrome, and two other   
   80 Col. Modes (All 80's are RGBI).  "   
      
   Right now it handles CGA fine but I am curious if it can possibly handle MDA?   
      
   If anyone knows of a better place to ask please lmk, I was trying to avoid   
   signing upto multiple commodore forums.  I've pondered trying to contact   
   Technicolor who consumed Thomson but not clue where to start.   
      
   Thanks   
      
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