Start the game with the doom -devparm command line to activate the corresponding cheat function. Note: The parameters marked with an asterisk (*) do not require -devparm in the command line. Most of these parameters can be mixed and matched to create different effects. For example, start the game with the doom -devparm -wart 1 8 -record demo01 -respawn command line would record a demo on episode one, level eight, with monster respawn. Finally, press F1 during development mode for a 256 color screenshot in .PCX format.
CHEAT FUNCTION - COMMAND LINE PARAMETER Read in a command line parameter file - @ Activates DeathMatch v2.0 (v1.4 and above) - -altdeath End the game after twenty minutes - -avg Uses C:\DOOMDATA directory for data - -cdrom Internal development, texture mapping - -comdev Read an alternate configuration file* - -config Start NetDoom in Deathmatch mode* - -deathmatch Dump debug info to debug.txt - -debugfile Developers mode - -devparm Start at indicated episode* - -episode <1-3> Uses original GUS instrument mapping - -GUS Uses new GUS instrument mapping (default) - -GUS1 Nightmare mode without respawn* - -fast Use external PWAD file* - -file <.wad filename> Set up a network terminal for the "left view"* - -left Starts from indicated saved game* - -loadgame <0-5> Set maximum size of LMP recording* - -maxdemo Starts NetDoom with indicated player amount* - -nodes <1-4> Internal bugging switch - -noblit Internal bugging switch - -nodraw Disable the joystick - -nojoy No monsters* - -nomonsters Disable the mouse - -nomouse Disable background music - -nomusic Disable sound effects - -nosfx Disable sound - -nosound Enable stereo music through OPL-3 on PAS16 - -opl3 Enable phase shifting on PAS16 - -phase Play back recorded demo* - -playdemo Record demo until you finish or die* - -record Record a demo from saved game* - -recordfrom <0-5> Internal development, texture mapping - -regdev Enemies respawn in non-Nightmare* - -respawn Set up a network terminal for "right view"* - -right Internal development, texture mapping - -shdev Start at indicated skill level* - -skill <1-5> Calculates number of times screen is redrawn during a demo - -timedemo Increases the speed of the marine - -turbo <1-255> Warp to episode (1-3) level (1-9) - -warp <1-3> <1-9> Load PWAD named ExMy.wad - -wart <1-3> <1-9> Unknown - -statcopy Unknown - -control