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Is it in anyway possible to get real-time with retropie-OS?
I want query my GPIOs in guaranteed time.
Not using Raspbian (the distro that is used in the RetroPie images).
Actual (hard) real time OS-es such as VXworks should be able to run on the pi, but not without significant work, and recompilation of all software.
I think you are really looking to minimize input-lag, or not?