Comment by jacquesm

I've used VxWorks as well, yes, it was slimmer (a lot slimmer, actually), but I would disagree that it was more reliable. QnX supported a ton of hardware out of the box and if there ever was unreliability as far as I've seen it it was always comms layer related, never the core OS or any other bits that you could put next to VxWorks and compare on a functional level. You just required a much bigger SBC to run it, and that's why we used VxWorks in the first place. But I would have been much happier with QnX. I'm imagining the modern day equivalent of QnX running on a Raspberry Pi Pico or one of the larger Arduino's or a Teensy. That would be an absolute game-changer.