This course is designed to prepare electronics personnel for further training in digital techniques, presenting need to know information that is basic to any maintenance course on digital equipment. It consists of seven study units: (1) binary arithmetic; (2) boolean algebra; (3) logic gates; (4) logic flip-flops; (5) nonlogic circuits; (6) magnetic cores; and (7) logic circuits. Each unit begins with a general objective and is divided into numbered work units, each presenting one or more specific objectives. Exercises and problems (with answers) are included with each unit and the manual concludes with a review lesson designed to help students prepare for the final examination, and containing a written examination to be submitted to the Marine Corps Institute. Supporting information (such as materials needed and forms for lesson submission, grading, and assistance) is also included. Previous knowledge of transistors is recommended before starting the course. (JN)