The Datacomputer was an ARPANET-connected database system supported by the Computer Corporation of America in Cambridge, Massachusetts.
It was intended as a computing utility sharing resources among multiple ARPA projects, in particular in seismology and climatology.
[citation needed] It was hosted on a DEC PDP-10 running the TENEX operating system (ARPANET host CCA-TENEX, address 31)[2] and was designed to support 3 trillion bits of storage (375 GB).
[3] The largest user of the Datacomputer was ARPA's Seismic Data Analysis Center (SDAC) (Alexandria, Virginia), which monitored underground nuclear tests.
The Datacomputer hardware had a three-level store: primary core, secondary hard disk, and tertiary mass storage.