[GreenKeys] TU replacement

[Harold Hallikainen]

> I've been copying ITTY with an old TU I built years ago.  It was for 850
> shift, 7 transistor and a polar relay.  Can't find any documents on it.
>
> So I figure it's not going to last forever.  The mod for narrow shift
> hangs on its leads.  When I found it, it looks like it used to have a
> switch to switch between wide and narrow shift, that's gone.
>
> Enough history.
>
> I've been reading docs about MMTTY, fldigi etc.  As near as I can tell
> they all are oriented towards squirting characters on the screen. I
> don't see an option to drive an external printer either by bit banging a
> digital I/O port or a USB device like the volpe board.
>
> Is there an existing solution and I missed it or?
>
> --
> John, W9DDD


Not existing right now, but I plan on building a demodulator using an
XR2211. I've used this in lots of projects over the years, including
driving a model 15 in the early 1970s.

Harold


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