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IBM 5100 Is the first portable computer it was released September 1975. The weigh was 55 pounds.
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The oldest laptop is called a osborne. it was made in year 1981.
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The gird compass was built in 1979, it was the most portable computer at that time. NASA used this computer for a space shuttle program in the latest 1980s. the release date was 1982.
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Macintosh portable is a portable laptop that was made in September 1989 to October 1991. It is sold by apple. It was released in September 20, 1989.
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IBM released the ThinkPad 775CD in 1994 the first laptop to feature an CD-ROM drive.