IBM 1009

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The IBM 1009 Data Transmission Unit was an IBM communications controller introduced in 1960.[1] The 1009 used the Synchronous transmit-receive (STR) protocol to transfer data at 150 characters per second (cps)[2]:p.577 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."[1][3]

The 1009 attached to IBM 1400 series computers such as the 1401[4]

In 1961 the transmission rate was doubled to 300 cps.[2]

In 1962 the 1009 was part of a test of data communications using the Telstar satellite to link two 1401 computer systems.[5]


  1. ^ a b IBM Corporation. "DPD chronology". Retrieved September 13, 2012.
  2. ^ a b Pugh, Emerson W.; Johnson, Lyle R.; Palmer, John H. (1991). IBM's 360 and Early 370 Systems. MIT Press. ISBN 0-262-16123-0.
  3. ^ "Data processing magazine". 3. 1961.
  4. ^ IBM Corporation (1964). IBM 1401 System Summary (PDF).
  5. ^ IBM Corporation. "IBM and Telstar". Retrieved September 13, 2012.

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