A display device system for driving a display having one of a plurality of predetermined
sizes provides a scalable instruction picture to instruct an operator in operation
of input devices. The system includes a device for accepting an operator input
selecting a scaling factor to adjust the size of the instruction picture such that
indicators in the instruction picture are arranged at spacings substantially equal
to spacing of the input devices. In an embodiment, the size of the instruction
picture is only adjusted in a width wise horizontal direction. Furthermore, scaling
indicators corresponding to a plurality of predetermined display sizes are optionally
provided to permit the user to select a scaling factor corresponding to the display.
