IBM 1009

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]

References
  1. IBM Corporation (23 January 2003). "DPD chronology". Retrieved September 13, 2012.
  2. 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. {{cite journal}}: Cite journal requires |journal= (help)
  4. IBM Corporation (1964). IBM 1401 System Summary (PDF). Archived from the original (PDF) on 2011-02-08. Retrieved 2012-09-13.
  5. IBM Corporation (23 January 2003). "IBM and Telstar". IBM. Retrieved November 8, 2021.


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