The reason Doom got a reputation that it can run on anything is that it did run on just about anything.
The original requirement was for a 386 CPU which ran between 12 and 40 MHz. The 386 was launched in 1985. That means that at the time the Doom was released, it could run on 8-year-old hardware.
I ran it perfectly on a 33MHz 486 with 4mb RAM for a long time. Even Doom II with some of its heavier maps ran fine.
But the point was that the hardware requirements were low enough that it could be ported to just about any hardware. It ran on SNES which was like 4MHz