BA123/RQDX3 floppy question

[Brad Parker]

I aquired an aged BA-123 a while back.  It has an RQDX3 and the
interesting "distribution board" for the MFM disks.

The floppy (dual RX50) has a cable coming out of it which just hangs in
the air.

I'm guessing that some kind soul removed a card which some how connected
the floppy cable to the disk distribution board.  I say this because at
the end of the BA-123 backplane there is a spacer and then two "qbus
like" slots.  The bottom slot has the MFM disk distribution board
connected plugged into it and the top slot is empty.

Anyone have a clue about this?  

I'll probably ditch the RX50 in favor of a stock PC 5 1/4" drive but
I'll still have to connect it to the RQDX3 somehow.

thanks!

-brad