the old Irwindale was using an electric pen to write down 1/4mile e.t., and mph, (from the tower Chrondecks) and half the time you couldn't read it. And that was ALL you got. Early 70s.
Same here. It was 1974 at the Keystone track, New Alexandria Pa.
Hand written,no reaction times Just 1/4 mile time and MPH.
To you that started drag racing on motorcycles,mine was a 72 CB350 Honda.