If you Google for 90stalps there is a document where you can look up by the DExxx model number (from the module's label) whether it needs the 12/5 supply or the 5-only supply. It also gives pinouts. Note that the pinouts for the 12/5 and 5-only supplies are incompatible. IIRC you can double-check the pinout with a continuity tester. The metal bolt between the DIN and the backplane connector is grounded. The pinout in 90stalps is as viewed from the PLUG on the power supply cord. From my notes, here is a pinout for the 5-volt-only modules as viewed from the JACK on the module. G N P |~~~~~~~~~~~~~~~~| G K P [] | backplane conn | G P |________________| G=ground, P=+5V@2A, N=NC, K=empty this is a 7-pin mini-din, but 8-pin plugs can be used. bending one of the pins might help with insertion. ps/2 connectors will NOT work. I have thrown together a supply using a small enclosed switching supply. It works well. These days, one of those 5-volt switching wallwarts is probably also a possibility. Since DIN connectors accept fairly thin wire, you'll want to parallel 3 wires per rail (i.e. one per pin) to provide current handling capacity. -- Adam