if event.type == "train" then
  local exp = "2"
  local rec = get_line() or ""
  local res = exp==rec and "PASS" or ("FAIL | %s"):format(rec)
  digiline_send("lcd", res)
  atc_send("OCBBWI+R;")
end
if event.type == "ext_int" then
  if atc_id then
    digiline_send("lcd", "...")
    set_line("1")
    atc_set_text_outside("LINE 1")
    atc_send("S4")
  end
end