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Simulator Commands->Undo Command
Use this command to restart the simulation and execute all instructions up to and including the one that had just been executed when the previous go, step into, step over, step out or trace command was issued.
All breakpoints are ignored during re-execution.
The undo command cannot be used a second time without any intervening run command being issued since the simulator only saves sufficient information for it to back-up once.
The simulator uses the number of machine cycles counted up to the previous command to determine the location at which re-execution should stop. Therefore if any instructions are executed differently, execution might stop at a different location.