PDP-8 Extended Memory Data and Checkerboard Test

This document provides the operating procedures and technical details for the PDP-8 Extended Memory Data and Checkerboard Test (MAINDEC-08-DHKMA-C-0). The diagnostic is designed to detect memory failures on PDP-8 systems by exercising memory from 8K up to 32K words with worst-case data patterns, including all zeros, all ones, and checkerboard configurations. The manual covers system requirements, loading instructions, and detailed switch register settings used to control the test, select specific memory fields, and manage error reporting. It is intended for maintenance and diagnostic use to identify memory faults.