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* October 9, 1985: Announcement of the [[Intel 80286]]-based [[AT&T Computer Systems|AT&T 6300+]] with [[Merge (software)|Simultask]], a [[virtual machine monitor]] developed by [[Locus Computing Corporation]] in collaboration with [[AT&T]], that enabled the direct execution of an [[Intel 8086]] guest operating system under a host [[Unix System V#SVR2|Unix System V Release 2 OS]]. Although the product was marketed with [[Microsoft MS-DOS]] as the guest OS, in fact the Virtual Machine could support any [[realmode]] operating system or standalone program (such as [[Microsoft Flight Simulator]]) that was written using only valid 8086 instructions (not instructions introduced with the 80286). Locus subsequently developed this technology into their "Merge" product line.
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*January 1987: A "product evaluation" version of [[Merge (software)|Merge/386]] from [[Locus Computing Corporation]] was made available to OEMs. [[Merge (software)|Merge/386]] made use of the [[Virtual 8086 mode]] provided by the [[Intel 80386]] processor, and supported multiple simultaneous [[virtual machine|virtual 8086 machines]]. The virtual machines supported unmodified guest operating systems and standalone programs such as [[Microsoft Flight Simulator]]; but in typical usage the guest was MS-DOS with a Locus proprietary [[Network redirector|redirector]] (also marketed for networked PCs as "PC-Interface") and a "network" driver that provided communication with a regular user-mode file server process running under the host operating system on the same machine.
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