Here's an old post I made on the subject,
Well, there are also several ZX spectrum versions, and Wolf3D clones for Ti-99. However, all of these "Doom ports" are complete remakes from scratch, which use little or none of the original data or source code.
Most of them can be accurately described as a 3D-maze engine with enemies, not much different than a 3D version of Pacman, with the label "Doom" slapped all over them.
To my best recollection, the most minimal proper versions of Doom, able to use at least part of the original graphical and sound data and being at least in part based on the original source code, include most of the early console ports (SNES, 3DO,32X etc., all of which run Doom worse than a typical 1994 PC), or, appearing much later, the GBA version.
I would also rank Amiga and ATARI ST source ports with the lowest-spec "true" Doom source ports (not wolf3d-ish remakes), but I'm not aware of their actual minimum specs. I assume they'll be something like 2 or 4 MB of RAM and a 68020...
The minimum possible configuration at which it appears possible to actually run a playable Doom-like FPS game on CPU power alone boils down to a 68020 CPU (Amiga 1200) and 2 or 4 MB of RAM (like the first true 'Doom-like' FPS games on the Amiga, Alien Breed 3D and Gloom prove).
Symbian PDAs and the such are not even worth considering in such a list, as they have a CPU power at least comparable to a 1st-generation Pentium.
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Last edited by Maes on Aug 8 2007 at 23:04