[bitwize]

Here's something to bake your noodle:

Apple makes Lightning to HDMI dongles that contain 400 MHz Samsung ARM SoCs and 256 MiB of RAM onboard.

They run frickin' Darwin.

There is more power in one of those dongles than there was in the OG iMac, and it runs a cut-down macOS. No cap.

And yes, Doom has been ported: https://m.youtube.com/watch?v=4XCkeN0XuqA

[ASalazarMX]

"it is tempting, if the only tool you have is a hammer, to treat everything as if it were a nail." -- Abraham Maslow

[bitwize]

Apple has an RTOS, called RTKit, that it uses for certain devices that have to hit ridiculously tight timing windows, or which don't have enough resources to support a full xnu kernel, such as the AirPods and Apple Pencil.