On 21/06/2021 18:12, Antonio Carlini via cctalk wrote: > I found the IPB on bitsavers and that lists the P4 phosphor and a > later CRT with the P40 phosphor. I think both of those are white. > > > I did find one seemingly untouched image of a VT100 with green text: > https://vistapointe.net/cliparts/getsecond. That does appear to be a > VT100 (not a VT102/VT103 etc) and is green. > > I did find many more white phosphor pictures than green (and no amber > at all). >
The VT640 had a green phosphor. This was a 3rd party upgrade for the VT100 from Digital Engineering which gives the VT100 graphical capabilities. Part of the upgrade involved changing the picture tube. I suspect this was to reduce flicker as the phosphor has a high persistence. Here is an original advert for the upgrade: https://books.google.co.uk/books?id=rO0QAcSJpQUC&pg=PA27 Matt
