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]
References
- ↑ 1.0 1.1 IBM Corporation (23 January 2003). "DPD chronology". http://www-03.ibm.com/ibm/history/exhibits/dpd50/dpd50_chronology2.html. Retrieved September 13, 2012.
- ↑ 2.0 2.1 Pugh, Emerson W.; Johnson, Lyle R.; Palmer, John H. (1991). IBM's 360 and Early 370 Systems. MIT Press. ISBN 0-262-16123-0. https://archive.org/details/ibms360early370s0000pugh.
- ↑ Data processing magazine. 3. 1961.
- ↑ IBM Corporation (1964). IBM 1401 System Summary. http://www.textfiles.com/bitsavers/pdf/ibm/14xx/A24-1401-1_1401_sysSummary.pdf. Retrieved 2012-09-13.
- ↑ IBM Corporation (23 January 2003). "IBM and Telstar". https://www.ibm.com/ibm/history/exhibits/space/space_9208ph11.html?fbclid=IwAR3EMFHZOCSQ7mxlEpBMCvfpS_zVEVpof9qWeTWtKa14GUomciwRIdLB5kY. Retrieved November 8, 2021.
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