This is a course in assembly language programming of the MIPS processor. It emphasizes the topics needed for the study of computer architecture: bits, bit patterns, operations on bit patterns, and how bit patterns represent instructions and data. This course is equivalent to a semester-long junior college or university course (except, perhaps, for the emphasis on bit patterns). The emphasis of the course is on understanding how computers work. This will provide a basis for further study of computer architecture and computer software. The MIPS processor, the subject of this course, has a well-designed architecture and is particularly fruitful to study.