PhDoom is a Doom source port designed to run under the Photon microGUI on a QNX 4.25 OS.

• No sound support.
• PhDoom will try and set system tick size to 2 msec in order to achieve acceptable frame rate. Therefore, you have to run the program as root, otherwise, set tick size manually.

To see a full list of all available command line options type

use phdoom

To play, an IWAD file is needed. Place your IWAD file in in one of the following locations:

1. Directory listed in the DOOMWADDIR environment variable
2. /usr/local/share/doom
3. Current working directory