[GreenKeys] USB interface for 5-level machines

[Hugh Pyle]

Yes.. the data transmit on current loop is 40mA (where 32ASR would want
20mA), but additionally the dial protocol uses reversed current!  Very
interesting, but maybe more complexity than you need.

On Sun, Mar 17, 2019 at 6:04 PM Jim Haynes <jhhaynes at earthlink.net> wrote:

> Looks like it is slightly more elaborate than that, as he says it is
> emulating the Telex current loop interface.  Which involves polarity
> reversal and dialing the number and that sort of stuff.
>
>         ---
>
>         "Ya can argue all ya wanna, but it's dif'rent than it was."
>         "No it ain't! No it ain't!  But ya gotta know the territory."
>                 Meredith Willson, The Music Man
>
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