I had the neck reset on my '73 JS II bass. Seemed like it was a pretty ordinary mortise/tenon glue-in joint. What you'd expect to find on a solid body guitar with a glue in neck:
Mortise (\'mort-?s\) n: a hole cut in a piece of wood into which another piece fits to form a joint.
Tenon (\'ten-?n\) n: the shaped end of one piece of wood that fits into the hole in another piece and thus joins the two pieces together.
I would think the S-100 would be just the same, but I'd sure like to know if it's different!