The block on the bottom of the storage tube is always the one placed, and when a block is erased, it is automatically stored on the top.
32.
A fourth CRT, without the storage electronics of the other three, was used as the output device, able to display the bit pattern of any selected storage tube.
33.
However, the 4002s had the unique feature that only a portion of the screen was a storage tube, with a small section set aside for normal refresh-based drawing.
34.
CADDS3 was introduced in the late 1970s on the CGP80 and CGP100 using Tektronix storage tube vector devices as display terminals and graphics tablets with menus for operator input.
35.
A storage tube is similar to a conventional tube except that it is equipped with a metal grid coated with a dielectric layer located immediately behind the phosphor screen.
36.
The competing lower cost Tektronix 4010 graphics terminal used an alternative storage tube CRT technology which required no continual refresh and hence no local computer display memory at all.
37.
A specialized type of storage tube, the Williams tube, was used as a main memory system on a number of early computers, from the late 1940s into the early 1950s.
38.
Mashberg, in a recent interview, said he was given a fast look, under a flashlight's beam, of a picture, unrolled from a storage tube, that appeared to be the Rembrandt seascape.
39.
If a visible output was needed, a second tube connected in parallel with the storage tube, with a phosphor coating but without a pickup plate, was used as a display device.
40.
This version of CADDS moved display technology from storage tube base displays to raster graphics and introduced the dedicated graphics co-processor board known as the Graphics Processing Unit ( GPU ).
