IBM 1009

[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.

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