PDP-12 Display Control and Scope Test

This document contains diagnostic test software for the PDP-12 display system. It includes instructions for loading the program (DIS TEST VERSION 1B), as well as a complete assembly listing of the code. The test generates three distinct patterns on the scope to verify the display system, including a full-screen grid and diagonal lines used for calibrating deflection amplifiers. The program allows users to display patterns in different quadrants and sizes, and supports options to freeze the display or alternate between sequences.