“Miscellaneous computer parts with various functions. A computer geek's dream.”
The Vault 15 computer parts are a quest item in Fallout 2.
They can be given to Tandi in NCR in order to complete the quest Retrieve Parts/Gain Access to Vault 15 without having to deal with Darion or create a partnership between NCR and the squatters.
The parts are located in a locker on the 3rd floor of Vault 15.