| Clock: The clock records time in seconds and tenths of seconds. The clock only runs during the simulations of Run mode. If the simulation starts running from Stop mode, the clock starts running from zero. Clicking on Pause stops the clock. Clicking on Run again restarts it. Clicking on Rewind returns the clock to the time of the last pause during the current or last simulation. Each subsequent rewind sets the clock back one more pause until the clock reads zero. If the simulation was never paused, then clicking Rewind resets the clock to zero. The display on the clock during Stop mode is determined by the time the simulation ended and the use of the Rewind button. The clock initially displays zero.