The world's first portable computer that is launched by IBM in 1975 September .IBM 5100 have 1.9MHz CPU ,and RAM have two kinds: 16K and 64KB .Moreover ,it have 5 inches monochrome display,support 64 X 16 text display and have 200K tape storage.At the same time ,IBM 5100 have 25 kilograms weight , and price is RMB120000 .The price is more higher than some cars at that time .If you feel how heavy your notebook, just think about it!
