The CRT display subsystem of the IBM 1500 instructional system

The IBM 1500 Instructional System is an experimental system for computer-assisted instruction, designed to administer individual programmed lessons to 32 students at once. Working through one or more teaching devices at his own instructional station, a student may follow a course quite different from, and independent of, lessons presented at other stations. Instructional programs stored in central files control lesson content, sequence, timing, and audio-visual medium, varying all of these according to the student's responses.