I recently got really lucky and picked up a TR-606 for stupid cheap.
I made this simple little breakout both to interface with my eurorack system:
Just 4 jacks. Cut the end off a MIDI cable and broke out the cables in the box.
The DINSync jack on the TR-606 puts out Clock, Reset, Start/Stop, and Fill. The box can work as an input or output source for the syncing, so my 606 can act as a master or a slave.