Before Jaco went back to Florida (where he would eventually die) he played in the San Francisco bay area with drummer Brian Melville and even recorded an album with him.
This clip is from that time period, and although not the Jaco from 10 years before, it is still amazing what he could do. It looks like he is playing his famous Bass of Doom but with a fretted neck on it instead of a fretless.
This might be the only footage of Jaco ever playing his adaptation of Bach's Chromatic Fantasy. Watch a bit of history.