Serial Deluxe Digital Panel This panel replaces all previous Serial Deluxe Digital product, and uses a "phone-type" connector. The following circuit board(s) are compatible with the above topside: 59-138-1031, 59-138-1039, 59-138-1044, 59-138-1580, 59-138-1602, 59-138-1608, 59-138-1656, 59-138-1038, 59-138-1580