GS newbie questions

[Kate Slaminko <krslam@netscape.net>]

Picked up a GS Woz for $5 at a garage sale.  No manuals, and am having
some trouble figuring it out.
(1) There's a small card that says SuperSonic by MDIdeas Inc. on it with
a pair of cables running to J25 on the motherboard.  What does it do?
(2) The daughterboard has 8 SIMM slots, four of which are occupied, so I
assume I've got either 4 or 16 Mb RAM.  However, the RAM disk
configuration only shows 1129 (or so) Kbytes available.  What's up with
that?
(3) I got both 3.5 and 5 1/4" drives that show up as slot 5, #1 and slot
6,#1 respectively.  Both drives check out fine, however when I set the
thing to boot from the 5 &1/4 drive, it won't.  I'm trying to load some
old autobooting s/w on 5.25 disks and can't believe they're all bad,
especially since they pass the verification test.  Is there a problem
with the drive? the computer? or the operator?

Please respond directly to me as I won't be spending much time on the
group until I get this thing running properly.

Thanks!
Ron