Running Doom on a real Atari ST instead of Eschenburg's emulator will likely prove challenging. The 1985 PC, the first entry of Atari's TOS platform, features an 8 MHz 68000 CPU and up to 512 KB ...

In this case, the Atari ST has its own specs that push the boundaries of what's necessary to be able to play Doom. The end result is a heavily dithered experience comprised of a total of 16 colors.