Unidentified peripheral in Tektronix PDP-11/20 system
wdonzelli at gmail.com
Sun Jan 26 11:15:50 CST 2020
> 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!
That family of tubes is called an electron bombardment semiconductor.
The target is actually a semiconductor wafer with an array of diodes
to sense the position of the deflected swept beam, arranged in a Gray
code. I did a video on one of the tubes sometime ago on my Youtube
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