The IBM 1009 Data Transmission Unit was an
IBM communications controller introduced in 1960.
The 1009 used the
Synchronous transmit-receive
Synchronous transmit-receive (STR) was an early IBM character-oriented communications protocol which preceded Bisync. STR was point-to-point only, and employed a ''four-of-eight'' transmission code, communicating at up to 5100 characters per sec ...
(STR) protocol to transfer data at 150 characters per second (cps)
over a single point-to-point dial or leased telephone line. The system was advertised as being able to "link the magnetic core memories of IBM 1401 computers over telephone lines."
The 1009 attached to
IBM 1400 series
The IBM 1400 series were second-generation (transistor) mid-range business decimal computers that IBM marketed in the early 1960s. The computers were offered to replace tabulating machines like the IBM 407. The 1400-series machines stored infor ...
computers such as the
1401
Year 1401 ( MCDI) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.
Events
January–December
* January 6 – Rupert, King of Germany, is crowned King of the Romans at Cologne.
* ...
In 1961 the transmission rate was doubled to 300 cps.
In 1962 the 1009 was part of a test of data communications using the
Telstar
Telstar is the name of various communications satellites. The first two Telstar satellites were experimental and nearly identical. Telstar 1 launched on top of a Thor-Delta rocket on July 10, 1962. It successfully relayed through space the fir ...
satellite to link two 1401 computer systems.
References
External links
Photo of a 1009 at the Computer History Museum
1009
Year 1009 ( MIX) was a common year starting on Saturday of the Julian calendar.
Events
By place
Europe
* February 14 or March 9 – The first known mention is made of the name of Lithuania, in connection with the murder of Bruno ...
IBM transistorized computers
Computer-related introductions in 1960
Link protocols
Communications satellites
1962 in spaceflight
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