The GPUTCHR command works on the graphics screen, which size is the entire active screen in pixels (400 width and 240 height if using the top screen). The basic parameters for GPUTCHR are the coordinates of where to draw the string and the string itself, so you'd want your GPUTCHR command to look like this... GPUTCHR X,Y,"->" You can clear the graphics screen with the GCLS command.