supplementary activity By Eneko Orellana 1975 The IBM portable pc 5100 1981 The osborne 1 1982 Grid compas 1101 1983 Gavian SC 1984 Trs-80-model 200 1989 macintosh potrtable smaller,light,cheaper 1991 Macintosh 1999 The ibook 2020 Macbook