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 point-to-point dial or leased telephone lines. The system was advertised as being able to "link the magnetic core memories of IBM 1401 computers over telephone lines."[1]
The 1009 attached to IBM computers from the IBM 1400 series such as the 1401[3]
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.[4]
References
- ^ a b IBM Corporation. "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.
- ^ IBM Corporation (1964). IBM 1401 System Summary (PDF).
- ^ IBM Corporation. "IBM and Telstar". Retrieved September 13, 2012.
External Links
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