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This paper describes ASSIST-V, a software tool designed for use in the teaching of operating systems, fie management, and machine architecture courses. ASSIST-V is a program that provides an environment for the implementation, testing, and evaluation of systems software for the IBM 360 series machines. This capability is achieved by simulating all relevant aspects of the machine's architecture. In particular, ASSIST-V simulates interrupts, I/O channels, and I/O devices, as well as all IBM 360 machine instructions. In addition, ASSIST-V provides extensive debugging and statistics-gathering aids.