> On Oct 13, 2015, at 11:52 AM, tony duell <[email protected]> wrote:
>
>> The only other terminal I worked
>> with that could do that was a Tektronix storage scope terminal (4010
>> or 4014, IIRC). The Tek printer wasn't built-in, but it did take a
>> scan of the live screen, so that was similar. The paper was
>> silver-grey and I remember it coming out wet too. Everything else I
>> worked with was either thermal or dot-matrix impact, and could only
>> capture text as it arrived at the terminal, not a screen image.
>
> The tektronix printer (or 'copier' as they called it) was photographic. The
> paper was light-sensitive, and went past the screen of a 'flat' CRT (I think
> it only had deflection plates for one axis, the 'deflection' in the other
> direction coming from the paper movement). It really was an odd-looking
> tube.
I've never seen that printer. But the tube you describe was common in the
1970s in high end phototypesetting machines, such as the Autologic APS-5 and
the Linotron 202. I think the idea was to make high resolution CRT display
feasible by having to worry only about accuracy in one coordinate, not two.
The film movement (actually paper, essentially a roll of photo-print paper)
would provide the other coordinate. Unlike the Tektronix machine you describe,
phototypesetter output was developed in essentially the same manner as
photographic print, with developer and fixer chemicals, in a machine that would
take the paper casette as input and produce the developed/fixed/dried roll of
finished material coming out the other end. The roll of paper would then be
cut to separate the individual columns and articles, and pasted onto cardboard
page size boards to produce the finished layout.
At some point, there were machines that could produce page-width paper, but
those were rather expensive and useful only once you got software to do the
page layout on the computer instead of manually in the composing room.
I believe that phototypesetting is obsolete now, though it hung on surprisingly
long, certainly into the 1990s -- because laser printout was high enough
resolution to read, but not good enough to use as the master for offset
printing. I think phototypesetters were good to 1000 dpi or thereabouts,
unlike the 300-600 dpi of the first decade or so of laser printers.
paul
