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Simulator Commands->Undo Instruction
Use this command to restart the simulation and execute all instructions up to but excluding the one that has just been executed.
All breakpoints are ignored during re-execution.
This command can be repeatedly used to step backwards through the program one instruction at a time.
The simulator uses the number of machine cycles counted up to the previous instruction to determine the location at which re-execution should stop. Therefore if any instructions are executed differently, execution might stop at a different location.