Mainframe core

The mainframe core is a junk item in Fallout 76.

Characteristics
Completion of the Mission: Countdown quest requires a total of 15 undamaged mainframe cores. These can be obtained in one of two ways: by collecting damaged mainframe cores from the computer consoles in the lower level of Site Alpha, Site Bravo, and Site Charlie, and then repairing them at a Tinker's workbench. Alternatively, a small number of undamaged cores can be found scattered in the boxes and shelves that are present within the silos.

Crafting
A damaged mainframe core can be repaired for use in the Mission: Countdown quest:

As of Fallout 76 patch 1.1.0.8, leftover mainframe cores can no longer be scrapped and broken down in to its individual components for use in crafting.

Locations

 * Scattered randomly in the lower level of Site Alpha, Site Bravo, and Site Charlie.