On Monday, May 2, 2016 1:21 PM, Paul Koning <[email protected]> wrote:
> On May 2, 2016, at 3:59 PM, Mattis Lind <[email protected]> wrote:
>
> Yet another nice color brochure.
>
> https://dl.dropboxusercontent.com/u/96935524/Datormusuem/lab11.pdf
>
> Has anyone seen a VR20 in real? Rather interesting to be able to do a red
> and green X/Y screen based on different energy levels. Someone care to
> explain how that works?
See https://en.wikipedia.org/wiki/Penetron. The idea is that there are two
layers, and a high voltage beam pokes through the first to activate the second.
I think Tektronix made monitors of this type, but apparently GE invented them.
I remember hearing about that technology in the 1970s; I never actually saw one
in the wild (from any manufacturer).
> If I read the fine print on the back correctly (and comparing with the
> others) I would guess that this brochure is from 1971.
Assuming that 00771 is a date code, yes. The cover photo is interesting (PDP11
with PDP12 color scheme!) but the console looks like an LA30. I didn't know
those were out in 1971. The first (and fortunately only) one I encountered was
in 1974.
paul
I believe they used a beam penetration tube in the VR20. I have an HP 1338A
that uses that technology.Google it, it's interesting.
Bob
