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Starting with its version 7.0 (1972), [[Digital Equipment Corporation]]'s operating system [[TOPS-10]] implemented the SMP feature, the earliest system running SMP was the [[PDP-10|DECSystem 1077]] dual KI10 processor system.<ref>[http://www.ultimate.com/phil/pdp10/10periphs DEC 1077 and SMP]</ref> Later KL10 system could aggregate up to 8 CPUs in a SMP manner. In contrast, DECs first multi-processor [[VAX]] system, the VAX-11/782, was asymmetric,<ref>[http://www.bitsavers.org/pdf/dec/vax/EG-21731-18_VAX_Product_Sales_Guide_Apr82.pdf VAX Product Sales Guide, pages 1-23 and 1-24]: the VAX-11/782 is described as an asymmetric multiprocessing system in 1982</ref> but later VAX multiprocessor systems were SMP.<ref>[http://www.bitsavers.org/pdf/dec/vax/8800/EK-8840H-UG-001_88xx_System_Hardware_Users_Guide_Mar88.pdf VAX 8820/8830/8840 System Hardware User's Guide]: by 1988 the VAX operating system was SMP</ref>
Early commercial Unix SMP implementations included the [[Sequent Computer Systems]] Balance 8000 (released in 1984) and Balance 21000 (released in 1986).<ref>{{Cite book |last1 = Hockney |first1 = R.W. |last2 = Jesshope |first2 = C.R. |title = Parallel Computers 2: Architecture, Programming and Algorithms |publisher = Taylor & Francis |year = 1988 | pages = 46 |isbn = 0-85274-811-6}}</ref> Both models were based on 10 MHz [[National Semiconductor]] [[NS320xx|NS32032]] processors, each with a small write-through cache connected to a common memory to form a [[Shared memory architecture|shared memory]] system. Another early commercial Unix SMP implementation was the NUMA based Honeywell Information Systems Italy [[Honeywell XPS-100|XPS-100]] designed by Dan Gielan of VAST Corporation in 1985. Its design supported up to 14 processors, but due to electrical limitations, the largest marketed version was a dual processor system. The operating system was derived and ported by VAST Corporation from AT&T 3B20 Unix SysVr3 code used internally within AT&T.
Earlier non-commercial multiprocessing UNIX ports existed, including a port named MUNIX created at the [[Naval Postgraduate School]] by 1975.<ref>{{Cite web|url=https://core.ac.uk/download/pdf/36714194.pdf|title=MUNIX, A Multiprocessing Version Of UNIX|last=Hawley|first=John Alfred|date=June 1975|website=core.ac.uk|access-date=11 November 2018}}</ref>
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