You can use subcommand MW that scrolls PC element up or down inside GEPCD command. Positive parameter of MW means scroll down, negative scrolls up. Try to use MW 10 or MW 20 to reach bottom of the Step block. BTW do you know syntax like gepcd d,PCx.x.... that displays PC element, inserts values (iv) and enables online refresh (gvd) in one moment ? In this case use CTRL-B to break online refresh , then you can use MW subcommand.