Speaking from past experience with the DoE (I'm happy I don't need to deal with security like this anymore), there were constant and randomized checks to make sure fiber cables (they were all fiber to make it harder to tamper with and to avoid accidental RF) were fully visible (e.g. not hidden under a desk or something) and not tampered with. Also, lots of locks and doors, both electrical and mechanical. The guy at the front desk with a big gun probably helped too.
There’s an astonishing good balance of density and clarity of information needed to make these useful. This then also has to translate across both physical and screen forms.
Chart 5011 has a great breakdown on the depth of symbology too.
I've run Nextcloud for years primarily for webdav file sync and calendar+contacts. It pretty much just works. That's not to say there isn't any jank, but it's mostly if you try the more obscure apps e.g. I've set up the phone track feature and it worked for a while, but I've had trouble with it recently. Probably fixable, but I just haven't spent the time.
I would say it is the core component of my self-(vps)-hosted setup and easily the most valuable.
Even though this isn't a fully-fledged industrial system, I like the thought they put into those aspects. Particularly, I want to make a homebrew PLC myself someday and the 24V IO board they made would be a nice starting point for that.
The reason you would trust and FPGA more than a SoC is because putting in backdoors in an FPGA is much harder. If an FPGA is backdoored to the point where any soft core (whose layout kind be randomized to some degree) is compromised, then that would likely be obvious from the kind of inspections Bunnie has written about: https://www.bunniestudios.com/blog/2023/infra-red-in-situ-ir...
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