Anyway. To display an image with enough spatial & temporal precision we used oscilloscopes - the ones that HP were making for air traffic control. You drive these by supplying 2 voltages (X & Y) to move the beam to a point on the screen and then a logic unblank pulse that turned the cathode on/off.

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Oh how wonderfully analogue-digital 😍

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A side note entirely for @kathryndeplume.com The computer involved was started by typing into a console (not the VDU) a hex-code for the system start address and then pressing a button that set that address in the processor register.

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Here goes. I was at UCL for two years as a post-doc in the early 1980s doing vision research - the grant was for retinal painting: can you paint an image over time on the eye and see the whole. What we actually did was something else because I had just read Marr's papers.

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🐱💤

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