VT11

This document serves as a complete technical guide for the VT11 Graphic Display Processor, a high-performance unit that operates as a peripheral to PDP-11 series computers via the Unibus. The manual covers:

• Theory of Operation: Detailed explanations of the display processor's architecture, including timing, mode control, instruction sets, vector and character generation, and analog circuits.
• Maintenance: Procedures for system adjustments (character and vector alignment), troubleshooting methods for common issues such as display faults and light pen malfunctions.
• Diagnostics: Descriptions of maintenance programs (MAINDEC-11-DDGTA, DDGTB, DDGTC, DDGTG) used to verify system performance and aid in alignment.
• Reference: Comprehensive technical specifications, interrupt vector addresses, character codes, and a guide to engineering drawings and related documentation.