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All US cars sold with a year model of 1996 and younger had to be OBD enabled for smog testing if I'm not mistaken.
I know this because my 97 Accord can be checked just about anywhere state inspections are offered. Emissions are measured electronically through the pre and post cat oxygen sensors.
My 95 Lexus, however, has to be taken to a shop where they can run the engine in gear (rear wheels are on rollers in the shop floor) so a manual reading can be made from the back of the tailpipe.
Porsche has their own version of OBD called PST, now in it's second version. But it's far more than a cable... it has a laptop with a touch screen attached to the wire and plug, and can not only diagnose but reset and set all sorts of things, which a standard OBD II tool can't do.
Hope this helps!
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