Below is information about WHERE IS THE KEY TO THE VAULT TEC HEADQUARTERS MAINFRAME from a variety of sources. Please take a look at the materials that our team has selected for you.
https://www.ign.com/wikis/fallout-3/Agatha's_Song#:~:text=The%20key%20to%20finding%20Vault-Tec%20HQ%20is%20Vernon,have%20your%20weapon%20strapped%20and%20ready%20to%20go.
https://fallout.fandom.com/wiki/Forum:Where%27s_the_vault-tec_headquarters_key_for_the_mainframe
There´s three computers on the mainframe level which must be accessed in order to unlock the mainframe door. They all include a short description on how to access the mainframe (basically giving clearance from each computer) and allow you to switch off the masterbrain (which then also shuts down all automatic defenses/robots).
https://gamefaqs.gamespot.com/xbox360/939933-fallout-3/answers/13762-where-can-i-find-key-to-vault-tec-mainframe
Accepted Answer There is no key. You deactivated the security through the megabrain or whatever it's called. Now the door is permanently closed. You'll need to load an older save, do it all again,...
https://fallout-archive.fandom.com/wiki/Forum:Where%27s_the_vault-tec_headquarters_key_for_the_mainframe
Forum:Where's the vault-tec headquarters key for the mainframe - The Vault Fallout Wiki - Everything you need to know about Fallout 76, Fallout 4, New Vegas and more!
https://gamefaqs.gamespot.com/xbox360/939933-fallout-3/answers/71912-where-can-i-find-the-key-for-the-cell-in-vault-tech-hq
I found a way to at least get the info, just go to the room below (where the third terminal is) ( and jump on the tubes on the walls until you reach the mainframe and press the action button when...
https://fallout.fandom.com/wiki/Vault-Tec_headquarters
https://www.youtube.com/watch?v=7L585mVpSKM
A walkthrough of how to gain access to the mainframe in Vault Tec Headquarters without a key. Leave a like if you've found this video helpful! :)
https://www.gamerguides.com/fallout-3/guide/fallout-3-walkthrough/finishing-up-the-capitol-wasteland/vault-tec-headquarters
Continue through a cell door to find the Vault-Tec Mainframe, from which you can download information on all the Vaults in the area… 87, 92, 101, 106, and 108. Head down the stair cases in the north-western corner of the area map to make a quick trip back down to the previously inaccessible side of Guest Relations.
https://www.youtube.com/watch?v=DWMPBxRTJf4
Just showing you guys a neat trick that will let you get the info from the mainframe without having to mess with the terminals. Mainly this is because there ...
https://fallout-archive.fandom.com/wiki/Vault-Tec_headquarters_terminals
Vault-Tec headquarters terminals are a series of terminals in Fallout 3. They can be found on various places throughout the Administration section of the Vault-Tec headquarters in Vernon Square, Washington, D.C. Contents 1 System Operation 1 1.1 Important Bulletins 1.1.1 Message 009AC Security Notice 1.1.2 Message 0099D Vending Machines
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