In September 1975, the first portable computer, IBM 5100, was introduced with included a 1.9 MHz PALM processor, a five-inch CRT display, a tape drive, 64 KB of RAM, and its weighted 55-pounds.
In April 1981, a computer Osborne I, was introduced by Adam Osborne, which is considered to be the first portable computer or laptop. The computer was designed with essential features that offer benefit to users, such as two 5 1/4″ floppy drives, a 5-inch display, 64 KB of memory, ran the CP/M 2.2 operating system. Furthermore, the cost of this computer was $1,795 and weighed 24.5-pounds.
Later in 1984, the IBM portable was introduced by IBM PCD (PC Division) that included 30-pounds weight, and it was the first portable computer. In 1986, the PC Convertible computer was announced by the IBM PCD that was its first laptop computer, which included 12-pounds weight. Finally, the first notebook with an integrated CD-ROM, the IBM ThinkPad 775CD computer was introduced by IBM in 1994.