Start a game with either Human's or Orc's,
Go to the password screen and enter these passwords to get the following:
TSGDDYTD - invincibility
THRCNBNL - finish the game
MKTS - faster productions
NSCRN - reveals map
VRYLTTL - upgrades magic and gives you all spells
DCKMT - upgrades everything to maximum possible
NVRWNNR - lets you continue playing even after you've achieved your goal
YPTFLWRM - makes you lose the game
VLDZ - gives you 5,000 oil
You must go back to the game after each one you enter is finished and it will enable the cheat.
More cheats to be entered at the password screen
HTCHTXNS: Gain lumber
NTPRF: Laser show
GLTTRNG: 10,000 gold, 5000 lumber and oil
NGLS: Disable magical traps (runes, ect.)
NTTCLNS: Instant victory