DK8-EC Crystal Real Time Clock Engineering Drawings

This document provides the technical documentation and engineering specifications for the DK8-EC (M8830) crystal real-time clock, a component designed for the PDP-8E processor.

Key components of this document include:

• Master Drawing List: A summary of all related drawings, parts lists, specifications, and procedures for the DK8-EC.
• Parts List: Identifies the components required for the assembly, including the M8830 real-time clock module.
• Engineering Specifications: Details the operation of the real-time clock, which counts intervals at selectable rates of 1 Hz, 50 Hz, 500 Hz, or 5000 Hz. It explains the IOT (Input/Output Transfer) instructions used for control (CLEI, CLDI, CLSK) and details the timing/synchronization logic.
• Technical Diagrams: Includes a block diagram showing the crystal oscillator, frequency dividers, and interrupt/skip logic, along with operating conditions (temperature/power requirements) and associated software references.