Checkerboard Program for 1,024 and 4,096 Word Memories

This document, a permanent memorandum dated August 9, 1961, outlines a maintenance program for checking magnetic core memory and sense amplifiers in 1,024 and 4,096 word memories. The program creates checkerboard patterns to maximize noise on sense windings, allowing for margin testing of sense amplifiers. It includes instructions for selecting patterns via sense switches, details on checking and complement-checking procedures, operation instructions, and the assembly language source code for the program.