When JLS is run in batch (non-GUI) mode, a circuit file is loaded, the simulator run, and then the final contents of any watched elements (registers, memories) are printed to the standard output.
Simulation stops when there are no more events, a stop element in the circuit gets a 1 input, or the time limit is reached.
Watched register contents are printed in three ways: hexadecimal, unsigned decimal and signed (two's complement) decimal.
Only those words of a watched memory element that are different at the end of simulation than they were at the beginning of simulation are printed, showing both the initial value and final value.