XPost: sci.electronics.design   
   From: invalid@invalid.net   
      
   > So I also presume that this 8.867 MHz crystal drives the dot clock (shifting   
   > bus data into the 8275 CRT controller IC).   
      
   Or rather, loading 8-bit bus data into a parallel-to-serial shift register   
   and then into the 8275 CRT controller.   
      
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