You should mention for those who don't know it that Joel, the videographer is the author of the Sigrok project's great Pulseview logic analyzer tool, which is kind of a biggie for me as its perhaps the single piece of electronics software I use the most.
So, if people want to get the scoop on how to use Sigrok to jump start your electronics know how, OpenTechLab is the place to go.
BTW, Dave himself was a pioneer in the Prometheus-like making of logic analyzers affordable. Somewhere in my stuff I have some Acrobat files I saved from the web way back in the day a VERY long time ago.. More than 20 years ago, back when the web was young..
I went to all the trouble to capture all the plans and as much stuff as I could because it was unique.. an affordable logic analyzer back when they cost a lot more than they cost now..
Dave had designed it.
I think it used programmable logic devices...