Tascam 38 and maybe others Keyboard extension cable They were widely used by

They were widely used by audio manufacturers

I have other versions of this board

Nice panel from the original 80-8

Then they have to be  electrically checked for inductance

they sold tens of thousands of these units and now many are coming back into use as they was  very good unit to use as a mike pre-amp or headphones mixer and can be picked up very cheaply

Tascam 38 and maybe others Keyboard extension cable They were widely used byThis is a female molex to molex cable from a Tascam 38 but as the cables were common it may well fit other models. Useful if you want to extend yours with a suitable back to back 10 way molex connector (not supplied)