Doom (Acorn RiscOS)

Doom for Acorn RiscOS is an officially licensed port of Doom by R-Comp International based on the Linux Doom source code release, first released in for the   platform. It is accompanied by ARM3 Doom, a port supporting PCs, and is succeeded by the company's Doom+, a more advanced source port. As of 2018, the company offers a custom version of the Depths of Doom Trilogy for sale with the port. The R-Comp Interactive ports were programmed by software engineer Justin Fletcher.

RiscPC

 * Supports resolutions up to 1024x768 with color depths of up to 24 bits.
 * Supports scalable desktop window.
 * 8-channel stereo sound effects.
 * General MIDI music.
 * Works with all official IWADs.
 * Plays all standard correctly built PWADs.
 * Network-ready (TCP-IP/UDP, serial, and modem).

ARM3

 * 320x256 graphics at 8 bits per pixel.
 * ColourCard support (including 16 bits per pixel).
 * 8-channel stereo sound effects.
 * Works with all official IWADs.
 * Plays all standard correctly built PWADs.

RiscPC

 * 4 MB RAM required, 8 MB preferred
 * Hard disk with 1 MB free space; 30 MB recommended

ARM3

 * 4 MB RAM required, 8 MB preferred
 * Hard disk with 15 MB free space; 30 MB recommended
 * CD-ROM drive