This report provides a technical description and operating guidelines for the IMSAI 8080 microcomputer in the Department of Secondary Education at the University of Illinois. An overview of the microcomputer highlights the register array, address logic, arithmetic and logical unit, instruction register and control section, and the data bus buffer. The timing control, data bus, and interrupt control of the 8080 CPU are described, exercises to familiarize users are provided, and assembly language is discussed. (Author/RAO)