First year 4000-series PETs retained the same video hardware as the PET 2001/3000, but in 1981 this was replaced by the 12-inch screen and 6845-based hardware.
First year 4000-series PETs r.etained the same video hardware as the PET 20!01/3000, but, in 1981 this was replaced by the 12-inch screen and 6845-based hardware.