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The '''IBM 1009 Data Transmission Unit''' was an [[IBM]] [[Front end processor|communications controller]] introduced in 1960<ref name=DPD>{{cite web|last=IBM Corporation|title=DPD chronology|url=http://www-03.ibm.com/ibm/history/exhibits/dpd50/dpd50_chronology2.html|accessdate=September 13, 2012}}</ref>. The 1009 used the [[Synchronous transmit-receive]] (STR) protocol to transfer data at 150 characters per second(cps)<ref name=Pugh>{{cite book|last1=Pugh|first1=Emerson W.|last2=Johnson|first2=Lyle R.|last3=Palmer|first3=John H.|title=IBM's 360 and Early 370 Systems|year=1991|publisher=MIT Press|isbn=0-262-16123-0|url=http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=13138}}</ref>{{rp|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."<ref name=DPD /> |
The '''IBM 1009 Data Transmission Unit''' was an [[IBM]] [[Front end processor|communications controller]] introduced in 1960<ref name=DPD>{{cite web|last=IBM Corporation|title=DPD chronology|url=http://www-03.ibm.com/ibm/history/exhibits/dpd50/dpd50_chronology2.html|accessdate=September 13, 2012}}</ref>. The 1009 used the [[Synchronous transmit-receive]] (STR) protocol to transfer data at 150 characters per second(cps)<ref name=Pugh>{{cite book|last1=Pugh|first1=Emerson W.|last2=Johnson|first2=Lyle R.|last3=Palmer|first3=John H.|title=IBM's 360 and Early 370 Systems|year=1991|publisher=MIT Press|isbn=0-262-16123-0|url=http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=13138}}</ref>{{rp|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."<ref name=DPD /><ref>{{cite journal|journal=Data processing magazine|year=1961|volume=3}}</ref> |
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The 1009 attached to IBM computers from the [[IBM 1400 series]] such as the [[IBM 1401|1401]]<ref>{{cite book|last=IBM Corporation|title=IBM 1401 System Summary|year=1964|url=http://www.textfiles.com/bitsavers/pdf/ibm/14xx/A24-1401-1_1401_sysSummary.pdf}}</ref> |
The 1009 attached to IBM computers from the [[IBM 1400 series]] such as the [[IBM 1401|1401]]<ref>{{cite book|last=IBM Corporation|title=IBM 1401 System Summary|year=1964|url=http://www.textfiles.com/bitsavers/pdf/ibm/14xx/A24-1401-1_1401_sysSummary.pdf}}</ref> |
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Revision as of 00:22, 14 September 2012
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][3]
The 1009 attached to IBM computers from the IBM 1400 series 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
- ^ 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.
- ^ Data processing magazine. 3. 1961.
{{cite journal}}: Missing or empty|title=(help) - ^ IBM Corporation (1964). IBM 1401 System Summary (PDF).
- ^ IBM Corporation. "IBM and Telstar". Retrieved September 13, 2012.
External Links
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