Created by Stuart Madnick and maintained by Peter Higginson the Little Man Computer acts as an online simulation of a (simplified) CPU allowing you to program in a manner akin to Assembly Language while watching how your various instructions would travel along buses and into the Accumulator.
While limited in storage to just 100 commands or values the Little Man Computer still has the potential to act as a powerful educational tool to teach aspiring programmers the fundamentals of Assembly Language and to some extent the FDE cycle and involved CPU components.
LMC link