Complementing Checkerboard Program

This interoffice memorandum from January 1960 details the 'Complementing Checkerboard Program', a utility designed for testing magnetic core memory. The program functions by loading memory with a test word and its complement in a continuous loop to identify faulty or weak cores. The document includes:

• Operational Theory: Explains the continuous check, complement, and store cycle.
• Operating Instructions: Provides a step-by-step procedure for setting the test word, running the program, and identifying the address of faulty registers if a machine halt occurs.
• Technical Implementation: Contains a detailed assembly code listing for the program, describing specific instruction addresses and their functions during memory initialization and checking.