Is there an SM for the 3kT?
On the 3k, the keyboard lines run to U350 (CIA) pins 18 and 24 on the one side, and to pins 2 and 4 on the keyboard connector (4 is +5V and 5 is GND).
I'd guess the orange ones and the grey ones go together, but you should make sure with a multimeter.
Oh wait - it locks out the mouse as well?
