From: ohland@charter.net   
      
   INMOS XGA G200 Datasheet page 32   
      
   Support for multiple VRAM banks   
      
   The IMS G200 now supports up to 4 MBytes of VRAM consisting of devices   
   using nine row and nine column address lines. The VRAM internal   
   architecture must consist of a number of 512 x 512 (256 KBytes) memory   
   arrays, typically 256K x 4, since the IMS G200 supports a 9-bit   
   multiplexed VRAM address bus. Care should be taken not to exceed the IMS   
   G200 pin output loading characteristics, given in Table 21.25, when   
   connecting multiple VRAM devices.   
      
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