Unidentified peripheral in Tektronix PDP-11/20 system
elson at pico-systems.com
Sun Jan 26 11:09:34 CST 2020
On 01/26/2020 04:43 AM, jim stephens via cctalk wrote:
> They demoed a system with an exotic sampling system
> similar to that in that time frame at the university I
> went to.
> Jon Elson may recall it. Might have been as late as 73.
> It had a dual ended CRT with what was essentially a high
> speed scope shooting a silicon charged target from one side.
Tek sold several storage oscilloscopes that used an image
conversion scheme. One type had a microchannel plate
with the traditional scope electronics on one side and an
NTSC video scanning tube on the other side. So, you could
take a single-shot event, store on the microchannel, and
then display on a black and white TV monitor for an amazingly
long time. It took like 10+ minutes for the image to degrade.
I think it was later they made an electron beam digitizer
storage scope. The scope tube created a fan beam that was
deflected by single-axis deflection plates. The target had
patterns of stripes that decoded the beam into a binary code
that was then recorded in a digital memory. So, the fan
beam of electrons and the target formed the ADC!
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