It's the model 401A and connects to the PC via a serial port, from back when their electronics had a separate signal generator. Mine expired and I need to get my foam router up and running again. Neither company can repair or replace signal generators of that vintage. Sigh. Call me at 541-592-3375 if you have one you don't need...or if you can repair the one I've got. A 501A could be of interest as well (that's the USB version).
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