The PLATO IV computer-based educational system contains its own communications hardware and software for operating plasma-panel graphics terminals. Key echoing is performed by the central processing unit: every key pressed at a terminal passes through the entire system before anything appears on the terminal's screen. Each terminal is guaranteed…

This document explains the TUTOR language which is used by teachers to create or author lesson materials on the PLATO IV computer-based education system. After an introductory section, the second section explains how to display text and line drawings to students. The third section introduces subroutines, and it is followed by explanations of…