DK10 Real Time Clock

This document covers the technical specifications, theory of operation, installation, and maintenance procedures for the DK10 Real Time Clock used with DECsystem-10/PDP-10 computers. The DK10 acts as an interval timer, a time-of-day clock, and a non-PI in-progress timer, offering high accuracy via an internal 100-kHz crystal clock or an external clock source up to 400 kHz. The manual details the PDP-10 I/O bus interface, instruction bit assignments, and provides comprehensive engineering drawings and logic explanations to assist in installation, adjustments, and diagnostic troubleshooting.