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Photos: Dinosaur Sightings: 1970s computers

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October 12, 2007 4:00 AM PDT

The Model 5100 is IBM's first microcomputer (not a mainframe) and is also considered the world's first portable computer. At 55 pounds, it might best be described as "self-contained" rather than "portable."

Photo by Steven Stengel, Oldcomputers.net

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