PSIM: A processor SIMulator for basic computer architecture and operation education

A Processor SIMulator (PSIM) for a basic stored program computer architecture is described which graphically displays the architecture while showing the detailed operation on a per clock cycle basis. The instruction set consists of twenty-five instructions that can be combined to execute many complex capabilities including conditional branching. The current version of PSIM includes an assembler for compiling assembly language programs to machine language code, the ability to display values in various formats including decimal and hexadecimal, and the ability to display and write to a file the contents of the program memory at any point in the simulation.