Computosaures: Display technics in 1973, camera, screen shots
Display Technologies in 1973
Sorry, the translation is a hard task for me! You will find a lot of
I was not able to find the right words.
TV Cameras, displays, screens, applications
I had the opportunity to conduct a series of photographs when I
participated in the fair
Bourget in 1973. (A few days before the crash of the TU-144)
I propose to make the journey in 1973.
Some of the screen shots have been done in other occasions.
Be forgiving on the quality of the documents, because at the time, I
worked with the 25 ASA / ISO.
And as we see many machines used for aerial surveillance, they were
placed in the darkness.
(Flicker decreases when the brightness / lighting decreases)
Some photos are blurred, but they can still be of interest ...
Keyboard and screen machines
You will see keyboards, B & W or color monitors , completes
consoles connected to computers (Unitel, Schlumberger, ADDS, Sintra,
Raytheon PTS-100, Thomson TVT) a Teletype, a gender sensitive tablet
To view the images (from cameras or computers), it was screens that
used to be called at the time 'Monitor'. There were several types:
* 625 TV scan lines, 819 lines and 1029 lines (already in the HD)
* Scanning jumper or vectorial as can be seen in the 'radar' section.
Basically black and white.
But it had just been put on the market 2 new technologies vector color:
One was using special tubes with 2 guns (and thus 2 separate deviation
blocks), the other uses the principle of penetration into 2 layers of
different color phosphorus. For this was on the commutation of EHT ...
And the deviation of electronic beams depend on the speed of electrons
(hence their acceleration) should correct the deviation depending on
the color. [Depending on the penetration of electron-due to the
EHV-electrons incited a layer or the other. Hence color
green-yellow-orange-red] A real gas plant!
Genre camera anytime, avionics, low-light LLL, or missiles. There is
also a graphics memory 'slide projector coupled with a camera' which
served to do color graphics on the computer (at the time graphics cards
did not exist)
To make this kind of computer images, we used a camera linked to a
slide projector piloted by computer (Kodak carousel). A graphics card
(kind of 40x25 pixels 4-bit) would change the graphic B & W given
by the camera. It might as well mofidier the color of particular areas
and to facilitate the monitoring of a situation. The 4th bit used to
control the flashing. (Warning)
That is a huge pile of clichés. We can see simulations of power
stations, road traffic, the state of a ship, steering installation,
test ... From time to time you will see a "ribbon reading" ...
Remember, there was no floppy or hard drives! Everything depended on
punch cards at a rate of 10 characters per second (or more with optical
readers, but they were worth the price of a car!)
Many of these applications use the technique of pseudo-graphic
characters which was subsequently resumed for the French Minitel and
the first personal computers..
Images of radar displays (vectorial display or knight)
In that time, the radar screens were monochrome (orange P38 or P39)
vector technology did a refresh than a dozen images per second. It was
very persistent phosphor. And so as not to tire operators, it was
decreasing the brightness of the screens (which also gave more detailed
images) and put these screens in environments penumbra. Note the color