Spiral-bound original manual entitled “Apollo Guidance and Navigation System Lunar Module Study Guide / Primary Guidance, Navigation and Control, System Course 3100, Computer Utility Programs C3100,” Revision B date of November 1, 1967, prepared by the AC Electronics Division of General Motors. The manual, 8.5″ x 11″ x 1.5″, approximately 296 pages, contains five sections—Introduction to PGNCS Computer Utility Programs, Basic Control Routines, Input/Output Routines, Initialization Control Routines, and Miscellaneous Routines—with numerous related block sections to each, including: General Programming Concepts, Input-Output Channel Interface, Operator/Hardware/Program Interface, The Executive Routine, ISS Model Switching, and more. In fine condition, with some wear, label remnants, and slight creasing to the front cover. An impressive early guidebook detailing the G&N of the Apollo lunar module.
