I'm also interested in this information, and
haven't yet
found anything online.
I don't think the VT340 programming manual is online, although
http://vt100.net does have the graphics programming manual up.
Also, if anyone turns up a service manual for a VT340,
I'd
like to obtain a copy.
Again
vt100.net has the VT330 pocket service guide, which might
at least provide some clues.
If Fred reads this, I expect he'll point you to links for:
EK-VT340-IP-003 VT340 VIDEO TERMINAL Illustrated Parts Breakdown
EK-VT34R-SV-001 VT340+ Model G Service Guide
EK-VT330-IP-003 VT330 VIDEO TERMINAL Illustrated Parts Breakdown
EK-VT330-PS-002 VT330 Pocket Service Guide
EK-VT33R-SV-001 VT330+ Models G, H, and J Service Guide
Otherwise, email me in a few days and I'll see how big they are
and find some suitable way of getting the ones you want to you.
Antonio
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Antonio Carlini arcarlini(a)iee.org