Datacomputer
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. It operated from 1973 until 1980.

It was hosted on a DEC PDP-10 running the TENEX operating system (ARPANET host CCA-TENEX, address 31) and was designed to support 3 trillion bits of storage (375 GB). Besides storage, the Datacomputer also offered data conversion utilities which supported the multiple data formats used at the time.

The largest user of the Datacomputer was ARPA's Seismic Data Analysis Center (SDAC) (Alexandria, Virginia), which monitored underground nuclear tests.

The Datacomputer manipulated data using a custom Datalanguage. A sample retrieval request:
<poem>codice_1</poem>

The Datacomputer hardware had a three-level store: primary core, secondary hard disk, and tertiary mass storage. At the time, disk cost about $20/megabit, while mass stores, typically robotic magnetic tape systems, cost about $1/megabit. The service started in 1973 with disk storage only; tertiary storage using Ampex's Terabit Memory System (TMS) hardware, based on videotape technology, was to come on line in 1975. In 1979, TMS's capacity was 175 billion bits (22 GB), and the total data stored was over 500 billion bits (62 GB)
Q177524
ARPANET
MISC
Q8513
database system
Concept
Q65090984
Computer Corporation of America
UNK
Q49111
Cambridge, Massachusetts
LOC
Q1188445
computing utility
UNK
Q1172305
sharing resources
Concept
Q207361
ARPA
Concept
Q83371
seismology
Concept
Q52139
climatology
Concept
Q690079
DEC
ORG
Q1568240
PDP-10
Concept
Q2992529
TENEX
MISC
Q79738
GB
Concept
Q1783551
data conversion
Concept
Q88
Alexandria, Virginia
LOC
Q839647
core
Concept
Q4439
hard disk
Concept
Q193395
mass storage
Concept
Q193663
magnetic tape
Concept
Q261952
Ampex
ORG
Q747779
videotape
Concept
Q86751895
Datacomputer
UNK
Q86751895
Datacomputer
UNK
Q86751895
Datacomputer
UNK
Q86751895
Datacomputer
UNK
Q86751895
Datacomputer
UNK
1973-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1973
DATE
1980-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1980
DATE
1973-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1973
DATE
1975-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1975
DATE
1979-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1979
DATE
-10^^http://www.w3.org/2001/XMLSchema#decimal
-10
NUMBER
+31^^http://www.w3.org/2001/XMLSchema#decimal
31
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+375^^http://www.w3.org/2001/XMLSchema#decimal
375
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+20^^http://www.w3.org/2001/XMLSchema#decimal
20
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+22^^http://www.w3.org/2001/XMLSchema#decimal
22
NUMBER
+62^^http://www.w3.org/2001/XMLSchema#decimal
62
NUMBER
manufacturer
platform