Here's the pinout:
Never seen this type of connector anywhere. Also, this is for an old tape deck synchronizer, so this might technically be the incorrect subforum (or entire forum) to post this, but I think you guys would have a good idea about it. It's a 'computer' anyway
I don't think I'll be successful in finding both male and female connectors to make this cable, so I may just have to cut the short one I have and extend it somehow.