Converting a batch simulation program to an interactive program with graphics: Minicomputers in simulation

Interactive, menu-driven graphics and animation can make a minicomputer-based simulation more informative and more useful than an equivalent simulation running in batch mode on a large computer. Converting a large batch program to interactive operation with graphics is, however, a difficult problem. A top- down, modular approach is essential. As an example, we discuss a program that simulates vehicle motion and driver behavior at a signal-free intersection. We converted the original batch version into an inter active program. The final product, which runs inter actively with animated graphics on a PDP-11 mini computer, is a highly convenient tool for studying intersection design and traffic control.