Chasm: The Rift Cheats

Press BACKSPACE then TAB while playing to use the codes:

ammo - Full Ammo
fullmap - Full Map
kill - Kill All Monsters
chojin - God Mode
weapon - All Weapons
armor - 200 Armor
invisible - Invisibility
next - Skip Level
keys - Get All Keys
keys - All keys
kill - Kill all monsters
depth - Toggle horizon distance
reanimate - All monsters respawn
respawn [seconds] - Set respawn time
reverse - Reverse left and right sound channels
shadows [number] - Set upper shadow limit
go [level number] - Level select
kick [player number] - Disconnect player in multi-player mode
killp [player number] - Kill player in multi-player mode
nick - Show current name in multi-player mode
nick [new name] - Select new name in multi-player mode

You can also starth the game using the following command lines parameters to activate the corresponding cheat function:

-nosound - Disable sound
-warp - Level select