Joker Poker came through the factory with a chime box just like EM pins had, yes, the System one Version. They did make some EM Joker Pokers but as stated above, system one Joker Pokers had a chime box stock from the factory.

Also, all system ones that had a sound card are downward compatible to have a chime box installed in them.
Cliff at pinball repair explains with pictures how to do it. I think the first 3 system ones had chime boxes, then after that it was sound cards