> 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
