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

Both are 16″ x 20″ capacity horizontal pivot mitering band saws. The S-23P is semi-automatic: the operator loads each piece and the saw clamps and cuts. The S-23A is fully automatic. Its cast iron shuttle multi-indexes up to 28.5″ per stroke, and the automatic PLC touchscreen stores up to 100 jobs with 20 in the queue, so it indexes, clamps, cuts, and repeats a full cut list on its own.