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Do they use a raspberry pi?
Or an Adafruit, perhaps?
Never heard of an adafruit SBC that runs Linux, but there's a ton of these SBC so it might be
I honestly have no idea what they run on, I just know that they exist, and therefore there's a fairly good chance that they at least CAN run Linux.
They probably only use it to display prices or ads so there's not much power required. Hell you could probably do it on arduino
You can run DOOM on an Arduino, no problem.
I prefer Key Lime Pie tbh
Probably too small for systemd.
I mean, I can hope smaller machines run smaller builds that can avoid systemd, at least.
Rpi does use systemd tho....
Raspberry pies are more powerful than you give them credit here. Nothing wrong with using systemd on them