old_contents: from chips.api.api import Stimulus, Response, Input, Output, Chip
  from demo.build_tools import build_vivado
  from demo.download_tools import vivado
  
  build_tool = build_vivado
  download_tool = vivado
  device =  "XC7A100T-CSG324-1"
  board="Atlys"
  
  def make_chip():
      chip = Chip("user_design")
  
      #create stimulus and response
      Input(chip, "input_eth_rx")
      Input(chip, "input_rs232_rx")
      Input(chip, "input_switches")
      Input(chip, "input_buttons")
      Input(chip, "input_timer")
      Input(chip, "input_i2c")
      Input(chip, "input_ps2")
  
      Output(chip, "output_eth_tx")
      Output(chip, "output_rs232_tx")
      Output(chip, "output_leds")
      Output(chip, "output_led_r")
      Output(chip, "output_led_g")
      Output(chip, "output_led_b")
      Output(chip, "output_seven_segment_cathode")
      Output(chip, "output_seven_segment_annode")
      Output(chip, "output_i2c")
      Output(chip, "output_vga")
      Output(chip, "output_audio")
  
      return chip
  
new_contents: from chips.api.api import Stimulus, Response, Input, Output, Chip
  from demo.build_tools import build_vivado
  from demo.download_tools import vivado
  
  build_tool = build_vivado
  download_tool = vivado
  device =  "XC7A100T-CSG324-1"
  board="Nexys4"
  
  def make_chip():
      chip = Chip("user_design")
  
      #create stimulus and response
      Input(chip, "input_eth_rx")
      Input(chip, "input_rs232_rx")
      Input(chip, "input_switches")
      Input(chip, "input_buttons")
      Input(chip, "input_timer")
      Input(chip, "input_i2c")
      Input(chip, "input_ps2")
  
      Output(chip, "output_eth_tx")
      Output(chip, "output_rs232_tx")
      Output(chip, "output_leds")
      Output(chip, "output_led_r")
      Output(chip, "output_led_g")
      Output(chip, "output_led_b")
      Output(chip, "output_seven_segment_cathode")
      Output(chip, "output_seven_segment_annode")
      Output(chip, "output_i2c")
      Output(chip, "output_vga")
      Output(chip, "output_audio")
  
      return chip
  
subject: Fix a typo