Doom Plus (Acorn RiscOS)

Doom+ is an officially licensed source port for  by R-Comp International. It is a more advanced port based on the company's original offering, with additional features and bug fixes, but requiring a more powerful machine to run. Like its predecessor, it is programmed by Justin Fletcher.

Features

 * Supports resolutions up to 1280x1024 with color depths of up to 24 bits per pixel.
 * Transparency and translucency effects.
 * Supports a scalable desktop window.
 * 8-channel stereo sound effects.
 * General MIDI music.
 * CD audio support.
 * Atmospheric music adjustment.
 * Works with all official Doom game IWADs.
 * Plays all standard correctly built PWADs, and can merge sprites and flats.
 * Network-ready (TCP-IP/UDP, serial, modem).
 * Includes a frontend and tools.
 * Joystick and gamepad support.
 * "Picture-in-picture" overlaid automap.
 * Low-detail mode restored.
 * Monster and player proximity sensor.
 * In-game real-time clock with settable alarm.
 * Enhanced "quick status" HUD.
 * Kills and secrets displayable in the automap.
 * Obituary messages.
 * Secret area found notification.

Bug fixes

 * Save game limit removed.
 * Visplane and drawsegs overflows removed.
 * Spectres appear correctly versus earlier Acorn ports.
 * Slime trail removal, similar to MBF.

System requirements

 * or higher, StrongArm Enhanced
 * 4 MB RAM required; 8 MB or more preferable
 * Hard disk with 1 MB free space; 30 MB recommended