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[edit]
- ^ a b IBM Corporation (23 January 2003). "DPD chronology". Retrieved September 13, 2012.
- ^ 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.
- ^ "Data processing magazine". 3. 1961.
{{cite journal}}: Cite journal requires|journal=(help) - ^ IBM Corporation (1964). IBM 1401 System Summary (PDF). Archived from the original (PDF) on 2011-02-08. Retrieved 2012-09-13.
- ^ IBM Corporation (23 January 2003). "IBM and Telstar". IBM. Retrieved November 8, 2021.
External links[edit]
 | This computer hardware article is a stub. You can help Wikipedia by expanding it. |