Official versions of Doom

Doom is one of the most widely ported video games in the first-person shooter genre. Starting with the original MS-DOS PC version (released as shareware on December 10, 1993), it has been released officially for a number of computer operating systems, video game consoles, handheld game consoles, and other devices. Some of the ports are replications of the MS-DOS version, while others differ considerably, including modifications to the level designs and monsters, with some ports offering content not included in the original MS-DOS version.

After Doom's source code was released to the public on December 23, 1997, several source ports were created by fans to allow the original PC version to run on modern operating systems.

Doom's initial release on December 10, 1993 was only for MS-DOS and had 320x200 pixel resolution. The releases include:

On April 30, 1995, an upgraded version of the game, The Ultimate Doom, was released, which contained an additional fourth episode, "Thy Flesh Consumed", in addition to the original three episodes.

This was the version that the MS-DOS product emerged from, since, at the time, id Software was using a NeXTcube for its graphic-engine development. This version is sluggish on anything below an 040 NeXTstation/cube (though it runs smoother with a higher amount of memory), and is missing sound, which was added on the PC side. With NeXT-Step based on i486 architecture, it ran smoothly under all conditions up to screen sizes of 400% with newer hardware. The version running on NeXT is 1.2, programmed by John Carmack, John Romero, and Dave Taylor.

Doom was ported to OS/2 by an independent contractor, Jim Thomas, who was hired by IBM to port it and SimCity. A successful version was demoed in 1994 running in an OS/2 PM window, and the last version, 2.19 beta, was released in 1997.

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