Yes I do have them working. I bought a couple of Compaq UW2 backplanes that also has a "Molex" dual row connector for power. Sitting along side mine is also a standard 4 pin Molex for a single drive, so getting pinouts for my 12 pin (as compared to your 14) was easy. Power is 12, 5 and gnd. The large connector is to handle the high current demands from all those drives. My backplane handles 10 drives each. First thing I did was use an ohm meter to group the pins into 3 groups. I then used the ohmmeter to map each group to the smaller single drive connector. If you don't have that smaller connector then it will take a little research on your part, but shouldn't be too bad with Google's help. Locate a known 12, 5 and ground pin on one of the 80 pin drive connector (or from a known device on the board, like a ground plane, or an ic pin.). The pinouts should be easy to come up with, I believe they are toward the outer side of the connector. You say you have an adapter? Trace that out. Should be the same.
Couple of questions regarding the adapter you bought. Are you supplying power via the molex connector?, are you assigning an address not in conflict with host? are you terminating the drive? can you hear the drive spool up? Jumpers on the adapter should deal with drive options. Keep in mind that the backplane most likely does address asigns and termination. Watch the hba's address however, don't test the board with a drive in a conflicting slot, won't work. What you might want to do is move the controller's address above the slot assignments of your board, now its a non-issue.