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Documentation of a 19 in one jam pcb change to a jrok pcb.The presence of a multi directional stick with thrust attached made defender and Stargate unplayable on the 19 in one pcb. Adding an up down stick made them playable A Jam harness was present in 19 in one multi and half of the wiring was the same as the jrok. The 12 volt wires that powered speaker in 19 in one are removed. A breadboard jumper wire was used to get to pin 14 (service)crude but effective. Coin door buttons were put back to to get to the menus etc. The tiny 4 pin molex that comes with the stargate to pcb adapter will be needed because invisible ,coin 3 and hi score reset buttons bypass the jam and connect direct to the jrok..I got a wrinkle on my home made plywood c p o overlay so Im redoing it and have a multi williams plexiglass ordered . I think I'm done with defender williams stuff and can move on now to an asteroids deluxe or tempest now .
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