text: from zorrom import mrom
  
  
  class Tutorial1(mrom.MaskROM):
      def desc(self):
          return 'Tutorial 1'
  
      def txtwh(self):
          # 16 columns, 8 rows
          return (16, 8)
  
      def oi2cr(self, offset, maski):
          '''Given binary (word offset, bit index) return image col/row'''
          return offset, 7 - maski
  
      def invert(self):
          return True
  