VT55

This document serves as the acceptance test manual for the VT55 video terminal. It provides instructions for the operator to run a series of thirteen diagnostic visual test patterns to ensure the terminal is functioning correctly. The document covers system requirements, including the necessary PDP-8 family computer hardware, loading procedures for binary tapes, and control switch settings. It details operation modes, including both switch register and keyboard-based pattern selection, and describes how to handle error messages. Finally, it provides a functional description of the test patterns, such as growing horizontal and vertical lines, histograms, and cursor tests.