What is the difference between the S-23P and the S-23A?

Both are 16″ x 20″ capacity horizontal pivot mitering band saws with an 8.8 HP blade drive. The S-23P is semi-automatic: the operator loads and positions each piece, and the saw clamps, feeds, and cuts under operator PLC control. The S-23A is fully automatic, with a cast iron multi-index shuttle and a PLC that runs a full cut list on its own.