OpenComputer x ComputerCraft - Hello World

local component = require("component")
local monitor = { }
if component.isAvailable("computercraft_advanced_monitor") == true then
  monitor = component.computercraft_advanced_monitor
elseif component.isAvailable("computercraft_monitor") == true then
  monitor = component.computercraft_monitor
else
  os.exit()
end
local gpu = component.gpu
local function TestScreen()
  local x = gpu.bind(monitor.address)
  if x ~= true then
    component.invoke(monitor.address,"write",0x11)
  else
    term.write("Hello World!")
  end
end
TestScreen()