On 10/14/2015 09:00 AM, Paul Koning wrote:
On Oct 13, 2015, at 11:27 PM, Jon Elson <el...@pico-systems.com> wrote:
...
Yes, I had a bunch of Versatec 1200A's with the Tektronix hard copy feature.
the Versatec was the greatest graphics printer until laser printers came out,
then they became instant boat anchors. Here's the process.
... And, with the Tek hardcopy board, it could hardcopy a Tek storage tube
terminal in less than 30 seconds.
Ok, but for screen hardcopy, the question is how the image on the screen is
read out so it can be fed to the printer. For the Tek storage tube case, that
presumably is done by scanning the screen with the beam, which will produce the
stored image in the same way as a TV camera tube works. But how would you do
that in a plasma panel?
Actually, the plasma panels used a bistable effect, that was
how the screen memory worked. Each pixel would stay lit
once the discharge was struck. The drive electronics could
scan a pixel and tell whether it was lit or not by the
voltage across the pixel.
Jon
