When I was watching one of this year’s most-admired films, “Boyhood,” there was an appreciative laugh through the audience when we got a glimpse of the computer game “Oregon Trail.”  The movie was filmed over a 12-year period, and so the “period” details were especially authentic and telling.  “Oregon Trail” is one of dozens of old-school computer/video games now available to play online for free.  Remember “King’s Quest?” “Leisure Suit Larry?” “Zelda Classic?” “SimAnt?” “Digger?” “Conquest of the Longbow?”  They’re back!