A box in an ALD occupies nine rows on the drawing.

1. a line
2. Type
3. MFI = Main Feature Index
4. Input tags, Output tags (voltage levels)
5. Frame, Channel(1), EC
6. Channel(2) (1 char), Slot (3 char)
7. SMS designation
8. Sub and the bottom line of the box
9. Coordinates on drawing, col (numeric 2-6) row (alpha A-H,J)