Quote:
There's no legend telling me what they're actually wired to.


Sorry, woops, that was in the other diagram. Both diagrams are linked from here

I'd actually missed pin 8 during this discussion because it was labeled in such a light gray color on that chart.

Anyway, the only things that the empeg uses for serial communication are pins 2, 3, and 5 (rx tx gnd), and those other pins (1 4 8), although they're used on a REAL serial port, aren't connected to any serial port circuits inside the empeg. Those are connected to amp remote, phone mute, and headlight sense.
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Tony Fabris