Alan Kay Dynabook Xerox NoteTaker IBM 5100 Xerox portable computer IBM
The potential utility of portable computers was apparent early on.  Alan Kay described the Dynabook in 1972, but no hardware was developed.  The Xerox NoteTaker was produced in a very small experimental batch around 1978. In 1975, the IBM 5100 could be fit into a transport case, making it a portable computer, but it weighed about 50 pounds.
