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FUNCTION    An 8-bit memory-mapped register for allocating the size of the
            global memory space.

                           Local Memory               Global Memory
      GREG Value       Range        # Words       Range        # Words
      0000 00XX      >0 - FFFF      65,536      ---------           0
      1000 0000      >0 - 7FFF      32,768      >8000 - >FFFF  32,768
      1100 0000      >0 - BFFF      49,152      >C000 - >FFFF  16,384
      1110 0000      >0 - DFFF      57,344      >E000 - >FFFF   8,192
      1111 0000      >0 - EFFF      61,440      >F000 - >FFFF   4,096
      1111 1000      >0 - F7FF      63,488      >F800 - >FFFF   2,048
      1111 1100      >0 - FBFF      64,512      >FC00 - >FFFF   1,024
      1111 1110      >0 - FDFF      65,024      >FE00 - >FFFF     512
      1111 1111      >0 - FEFF      65,280      >FF00 - >FFFF     256