the aux port next to the joypad ports can accept a standard A4000 style keyboard, plus a mate of mine had a box called the "CD32 communicator".
it was a box that plugged into the Aux port, and the serial port of an amiga and you needed to run something on both machines... i think it was the utilites unlimited CD on the CD32, that booted the CD32, disabled the 'reboot on CD door open', and set the aux port up as a serial port.
some software was run on the other amiga, and the CD32 showed up as a CD drive on the amiga.
which was pretty cool, if a little slow. but it worked.
I dunno about the control pad though... although, are you talking about the compotition pro pads? i think they released a range covering the cd32, snes, and megadrive? the snes and cd32 pads being visually identical?
--edit--
it was the weird science network kit.
plus there was a modem and IR box for that aux port too
CD32 expansions...
