display

mon = peripheral.wrap("left")
mon.setTextScale(5)
mon.clear()
pos = mon.getSize()

term.setTextColor(colors.red)    -- Red
print("Text to display:")
term.setTextColor(colors.white)  -- White
text = read()

repeat
  term.setTextColor(colors.red)    -- Red
  print("Delay (leave blank for default):")
  term.setTextColor(colors.white)  -- White
  delay = read()

  if delay == "" then
    delay = 0.2
    valid = true
  elseif tonumber(delay) < 0 then
    term.setTextColor(colors.orange)-- Orange
    print("Delay must be a positive number")
    valid = false
  elseif tonumber(delay) >= 0 then
    delay = tonumber(delay)
    valid = true
  end
until valid

term.setTextColor(colors.green)
print("Now displaying: " .. '"' .. text .. '"')

while true do
   pos2 = pos + text:len()
   mon.setCursorPos(pos, 1)
   mon.write(text)

   mon.setCursorPos(pos2, 1)
   mon.write(" ")
   sleep(delay)

   if pos == 0 - text:len() then
     pos = mon.getSize()
   else
     pos = pos - 1
   end
end