Digital Symbol Generator

This document is a technical manual for the Type 33 Digital Symbol Generator, manufactured by Digital Equipment Corporation for use with PDP-1 and PDP-4 computers. It serves as an ancillary system for the Type 30G and Type 30H Precision CRT Displays, enabling the display of alphanumeric symbols using a 5-by-7 dot matrix format.

Key Sections:

• Description: Covers the general function, physical specifications, and operating characteristics.
• Interface Signals: Details the signal protocols between the computer and the display for both PDP-1 and PDP-4 configurations.
• Logical Operation: Describes the point plotting mode, symbol generating mode, starting coordinate loading, format determination, and matrix generation logic.
• Maintenance: Provides instructions for electrical adjustments (delays and character size) and marginal voltage checking.
• Diagrams: Includes detailed logic diagrams, cable schedules, and wiring schedules for both Type 30G and 30H configurations.