Vr12 Display Test

This document is a technical manual for the "VR12 Display Test," a diagnostic program for the PDP-12 or PDP-12B system. The program is designed to test the display system by generating three distinct patterns on the scope to assist with calibration of the VR12 deflection amplifiers.

Key features include:

• Test Patterns: The program cycles through three patterns:

  1. A grid pattern for scope calibration.
  2. A pattern demonstrating character display across quadrants with varying sizes.
  3. An "X" pattern formed by diagonal lines from corners to help adjust deflection amplifiers.

• Operator Controls: The user can freeze the display on a current pattern, alternate between the three patterns, or return to the dial.

• Operational Requirements: The program requires a PDP-12 or PDP-12B, uses approximately 3K of core memory, and loads via a DIAL tape.
• Technical Content: The document includes the assembly language source code listing, a cross-reference table of symbols used in the code, and a record of revisions from 1969–1970.