DEC-10-H6AB-D VP10 Display Control Maint Nov69

This document is the Digital Equipment Corporation (DEC) PDP-10 VP10 Display Control Maintenance Manual (DEC-10-H6AB-D), published in 1969.

The VP10 Display Control is a peripheral device for the PDP-10 Computer System. Its primary function is to convert digital coordinate address words from the PDP-10 into analog signals (X, Y, and Z-axis for intensity) to drive an oscilloscope (e.g., Tektronix RM503) or a CRT display (e.g., DEC VR12), enabling point plotting of graphics such as mathematical curves, line drawings, or any binary data stored in memory. It is program-compatible with the DEC Type 30E Display Control.

Key aspects covered in the manual include:

• General Information: Provides a description of the VP10, its specifications (size, weight, power, temperature, output/logic levels), mnemonics, and a simplified overview of its major logic sections (I/O Bus Interface, I/O Bus Control, Display Control, XY Buffers and Digital-to-Analog Converters, Status Control).
• Installation: Details unpacking procedures, site selection requirements (e.g., space, environmental conditions), and cable interconnection.
• Operation and Programming: Describes the VP10's controls and indicators, I/O information, general operations, and includes a sample program demonstrating how to plot a square on the CRT. It outlines how the VP10 responds to I/O instructions (CONI, DATAI, CONO, DATAO) from the PDP-10.
• Principles of Operation: Explains the logical events triggered by I/O instructions, including conditions for setting display brightness, enabling high-speed plotting ("HI SPEED"), and using a "TEST MODE" to plot a diagonal line for diagnostics. It also covers the "CROBAR" condition and "LP STROBE" for light pen interaction.
• Maintenance: Outlines preventive maintenance (mechanical inspection, cleaning, electrical checks of power supply voltages, and margin checks) and corrective maintenance procedures (using diagnostic programs, signal tracing, and validation tests).
• Parts List: Lists the DEC FLIP CHIP Modules, semiconductors, power supplies, and indicator lamps used in the VP10, along with suggested spare quantities.
• Engineering Drawings: Provides block and circuit schematics for various components and logic sections.
• Appendix A - Light Pen 370 Technical Manual: Describes the optional Light Pen's function (detecting light pulses for computer interpretation), physical and electrical specifications, theory of operation (fiber optic light pipe, photomultiplier), and maintenance.

The manual is a comprehensive guide for anyone needing to install, operate, program, or maintain the DEC PDP-10 VP10 Display Control.