[GreenKeys] Interface ASR33 to Linux serial port

[Jim Haynes]

A few years back John Whitney connected a couple of 33s to a Linux
box so his boys could experience time-shared computing as we did it
back in the 1970s.  I remember he designed and built a special piece
of hardware for the purpose, but don't remember what it did.  Perhaps
converted TTY uppercase to lowercase.

John was on this group at one time, don't know if he still reads it.

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 	"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