Here are a list of main console commands:

NEW - start new game
RESTART - restart current level
QUIT - quit to dos

CHOJIN      - immortal code
AMMO        - restore ammo for all weapons
INVISIBLE   - gives 2 minutes of invisibility
ARMOR       - gives 200% of armor
FULLMAP     - allows you to see the fullmap of the current level.
KILL        - kill all monsters on the level
REANIMATE   - (debug) reanimate all monsters
RESPAWN <#time>  - set the monsters respawn time 
                 (#time=0 means no respawn).
SHADOWS  - set the upper limit of shadows casting 
                   by 3-D object.
GO <#level> - warp to specified level.