A lump is any section of data within the structure of a WAD
file, or a file containing such a portion of a WAD file. Each
lump has a name (up to 8 characters), which is not necessarily
unique. Lumps contain data such as: - Wall textures - Wall
patches - 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 humorous reminder about piracy, displayed at the 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 up to DEMO4, the
internal gameplay demonstration recordings, which are played in
a loop when the player is not actually playing the game. The
total number of demos depends on the IWAD: three for Doom, Doom
II, both halves of Final Doom,