I just recently made my own using a 10 and 5 pin connector from a pinball pin repair kit and a small piece of PCB wired as so:
1 -5
2 Key
3 +12
4 -5
5 +12
6 +12
7 gnd
8 gnd
9 gnd
10 gnd
11 gnd
12 +5
13 +5
14 +5
15 +5
Works fine in my Bubbles and Moon patrol