Reported are two papers which deal with the fundamentals of display hardware and software in computer systems. The first report presents the basic principles of display hardware in terms of image generation from buffers presumed to be loaded and controlled by a digital computer. The concepts surrounding the electrostatic tube, the electromagnetic tube, and the charactron tube are discussed. Hardware characteristics of devices which allow interaction with a display system are also explained. The second report focuses on the software aspects of operating display devices. Programming considerations involving commands, interrupts, and pen tracking are discussed in a general setting. Data structures are then presented for expeditiously handling several geometrical forms that occur frequently in applications of computer graphics. (RP)