Lump

A lump is any section of data within the structure of a WAD file. Each lump has a name (up to 8 characters), which is not necessarily unique. Lumps contain data such as:


 * Graphics
 * Sounds
 * Music
 * Demos
 * Sprites
 * Wall textures
 * Wall patches
 * Flats
 * Level maps and associated data (REJECT tables, NODES etc.)

Some lumps have specific reserved names. Examples of these are (from DOOM.WAD):


 * The PLAYPAL and COLORMAP entries, which define the colour palettes and the lighting level adjustments respectively;
 * ENDOOM, the 80x25 DOS screen containing credits and a friendly reminder about piracy, displayed at the MS-DOS console after quitting Doom;
 * DMXGUS, an ASCII text lump that maps the instrument patches used by DOOM's music for the Gravis Ultrasound (GUS) soundcard.
 * DEMO1 through DEMO4, the internal gameplay demonstration recordings, which are played in a loop when the player is not actually playing the game.