▁OS , ▁in ▁fact ▁the ▁Virtual ▁Machine ▁could ▁support ▁any ▁real mode ▁operating ▁system ▁or ▁stand alone ▁program ▁( such ▁as ▁Microsoft ▁Fl ight ▁Sim ulator ) ▁that ▁was ▁written ▁using ▁only ▁valid ▁ 8 0 8 6 ▁instructions ▁( not ▁instructions ▁introduced ▁with ▁the ▁ 8 0 2 8 6 ). ▁ ▁L ocus ▁subsequently ▁developed ▁this ▁technology ▁into ▁their ▁" Mer ge " ▁product ▁line . ▁▁ 1 9 8 7 ▁ ▁January ▁ 1 9 8 7 : ▁ ▁A ▁" product ▁evaluation " ▁version ▁of ▁Mer ge / 3 8 6 ▁from ▁L ocus ▁Comput ing ▁Corporation ▁was ▁made ▁available ▁to ▁O EM s . ▁ ▁Mer ge / 3 8 6 ▁made ▁use ▁of ▁the ▁Virtual ▁ 8 0 8 6 ▁mode ▁provided ▁by ▁the ▁Intel ▁ 8 0 3 8 6 ▁processor , ▁and ▁supported ▁multiple ▁simultane ous ▁virtual ▁ 8 0 8 6 ▁machines . ▁ ▁The ▁virtual ▁machines ▁supported ▁un mod ified ▁guest ▁operating ▁systems ▁and ▁stand alone ▁programs ▁such ▁as ▁Microsoft ▁Fl ight ▁Sim ulator ; ▁but ▁in ▁typical ▁usage ▁the ▁guest ▁was ▁MS - D OS ▁with ▁a ▁L ocus ▁propriet ary ▁redirect or ▁( also ▁market ed ▁for ▁network ed ▁PC s ▁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 . ▁ ▁October ▁ 1 9 8 7 : ▁ ▁Ret ail ▁Version ▁ 1 .