Gametitle-VBThe following is based on Van Buren and has not been confirmed by canon sources.

The ZAX Mainframe is the 5th sub-level of the Boulder Dome. Robobrain patrol these halls for intruders (high security level). The robobrains are programmed to stop the PC or anyone else from contaminating either the ZAX supercomputer, or its databanks. This means they will stop the Player character if they are irradiated.


The layout description is in accordance with the lettered picture to the right:

  • B: ZAX AI - Where the player character goes if they want to have a personal converstaion with ZAX
  • C: Emergency Generator - needs to be repaired to do any major work on ZAX or the reactor (not functionional)
  • D - R: Mainframe Databanks - long blocks/rows of databanks, most are full to capactity; guarded by robobrains.


The ZAX Mainframe did not appear nor was mentioned in any published games, but was going to appear in Van Buren, the canceled Fallout 3 by Black Isle Studios.

Design Document
CharactersScientistsAgnes · Donald · Goddard · James · Nina · Paul · Think tank · Xian · ZAX
TruckersBillie · Eddie Galenski · Helen Wheels · Jack · Joshua · Ribera · Tanner · Tyler
JackalsBanshee · Crazy Bitch · Howler
LocationsBoulder Train Station · Jackal camp · Baggers camp · Dead ghoul graveyard · Boulder Dome level 1 · Boulder Dome level 2 · Boulder Dome level 3 · Dome tunnels · ZAX Mainframe
QuestsBoulder Scientists Research or Write · Code Yourself Smarter · Defeat the Baggers/Larsen's Team · Destroy the Jackals · Destroy the Truck · Dope RadAway for Larsen · Dump Allies In the Dome · Establish Radio Contact & Trade With Denver · Find out about Wagner · Find out what ZAX is calculating · Fix Things in the Dome · Get the Medical Implants · Give Slaves to Boulder to Make Robobrains · Heal Helen's Kids · Jimmy the Cannibal · Quarantine the Glow Bugs · Research Plague Data · Robobrain a CNPC · Sleep Through Presper's Holocaust · Stabilize the Reactor · Take Computer Classes · Tell the BOS about the Dome · Trade Holodisks to the Geeks · Use Think Tank for Data
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