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You can use Little Man Computer (online) here: http://peterhigginson.co.uk/lmc/. Another version with a slightly more fancy interface can be found here: https://www.101computing.net/LMC/
What is it? The Little Man Computer (LMC) was created by Dr. Stuart Madnick. The LMC models a simple von Neumann architecture computer, so it has all of the basic features of a modern computer. The LMC can be programmed in machine or assembly code, and the following simulator will allow you to run your programs.