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0x6F ( 111 )  Tile Definitions Base Address
  
BitsDescription
71 to select bank 7, 0 to select bank 5
6Reserved, must be 0
5:0MSB of address of tile definitions in Bank 5
Notes:
  The value written into bits 5:0 is an offset into 16K bank 5 or 8K bank 7
  allowing the tile definitions to be placed at any multiple of 256 bytes. The
  value written here can be thought of as the MSB of an address in bank 5
  0x40-0x7f or bank 7 0xc0-0xff. Because bank 7 is only 8K in size, addresses
  wrap across the 8K boundary instead of the 16K boundary.