Predictive Analytic Machine The Predictive Analytic Machine or P . A . M . for short , is an extremely sophisticated supercomputer wired to a modified Assaultron unit , currently installed at the Railroad HQ in 2287 . Background . The development of the Predictive Analytic Machine , abbreviated P . A . M . , was green - lighted in 2067 , commissioned under the P . A . M . Initiative . This was a joint project between the Defense Intelligence Agency and the military to develop an advanced supercomputer capable of accurately predicting the future , utilizing the most sophisticated algorithms and mathematical formulas known to man . Her prediction models depended on the data fed into her systems by her human operators . P . A . M . was primarily intended for use in performing complex modeling for war . She was eventually wired to a modified assaultron , granting her increased mobility . This made it easier for P . A . M . to be dismantled and relocated in the event of an enemy attack . Although the project had suffered numerous setbacks and other misfortunes during the duration of its course , P . A . M . managed to correctly predict that Chinese nuclear warheads directed towards the United States would soon be deployed . With this information at hand , the military was able to mobilize its own fleet of ballistic missiles and raise the DEFCON status to the highest level in preparation for an upcoming invasion . Although the Great War only last two hours , the nuclear exchange had silenced the majority of the larger pockets of human civilization across the globe . Due to its isolated location , the Switchboard never took a direct hit , sparing P . A . M . from the wrath of atomic fire . With her human operators now deceased , the computer ' s systems began to shut down , leaving her in a dormant state for over 200 years . It was only when the Switchboard was discovered by Railroad operatives that P . A . M . would sense the presence of another human , following over a century of inactivity . The organization ' s technological experts were able to reprogram the computer to support their cause . P . A . M . would soon prove herself to be an important asset to the success of the Railroad ' s cause in the Commonwealth . However , the Railroad contingent stationed at the Switchboard had secretly been under the observation of enemy Institute spies . A squad of synth s was soon dispatched to storm the facility and exterminate the Railroad presence there . Despite the heavy casualties , the survivors of the attack managed to save P . A . M . from being claimed by Institute forces , thanks to her robotic frame . She was eventually relocated to and installed in the organization ' s current headquarters in the catacombs of the Old North Church . Now a vital asset of utmost importance to the Railroad ' s cause within the region , P . A . M . ' s advanced mathematical capabilities and large databases of information about the region ensure that operations are carried out efficiently , with little to no chance of failure , plus avoiding deadly destruction and annihilation at the hands of the Institute . Due to the fact that the human race is a extremely complex set of variables , P . A . M . constantly requires herself to revise her algorithms in order to ensure accurate prediction models , especially when wild cards like the Sole Survivor are taken into account . Appearances . P . A . M . only appears in " Fallout 4 " .