Supplementary activity 20 By NoraLanda 198 Macintosh Portable 1975 The IBM portable PC 5100 1981 The Osbone 1982 Grid compass 1101 1983 Gavilan SC 1984 TRS-80 model 200 1989 Macintosh Portable, Smaller, light, cheaper 1999 The IBook 2006 Macbook