IBM 1800
The IBM 1800 was a process control variant of the IBM 1130 with two extra instructions (CMP and DCM) and extra I/O capabilities. Unlike the 1130, which was a desk-like unit, the 1800 is packaged in typical IBM racks.
See also: IBM 1710 predecessor IBM System/7 sensor only successor
External links IBM 1130.org which has significant information about the 1130 and 1800. Corestore.org which recently acquired an 1800 from a Canadian power plant and reports others are still in service."Evolution of Small Real-Time IBM Computer Systems" (1.25 MB PDF file), from the IBM Journal of Research and Development.
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