Real-Time Clock Options

This document covers the technical details for the DK8-EA and DK8-EC real-time clock options for the PDP-8/E. It explains that these options allow for program interrupts at predetermined intervals, either derived from power line frequency (DK8-EA) or a crystal oscillator (DK8-EC). The document provides a detailed breakdown of the control logic, including the select logic, interrupt flip-flop logic, and clock flag logic, accompanied by block diagrams and descriptions of IOT instruction handling.