This is also the first computer from IBM that operated on batteries.
IBM began work on a laptop in 1983 that would be equivalent to the Tandy 100. However, it was rejected because it is not compatible with the IBM Personal Computer line.
In 1984 a portable computer was released, the IBM 5155. However, this was not a laptop but rather a luggable PC. The real laptop was released in 1986 as the IBM PC Convertible (model 5140).
3 models have been released. The Model 1 uses an unlit LCD screen. Model 2 and Model 3 both have an illuminated screen, which makes them much more readable.
The screen is a monochrome CGA screen which can display 80x25 characters or 640x200 and 320x200 pixels in graphic mode.
Expansion is possible via an ISA-compatible port on the back.
The machine turned out not to be a sales success. It was seen as too expensive for the hardware you got for it ($ 1995 introductory price). The IBM PC Convertible does not have a serial or parallel port as standard, something other (cheaper) brands had as standard. Moreover, these other brands were also faster or even had an 80286 processor.
Also the 1987 Model 3 which was slightly cheaper ($ 1695) did not change the success.
In 1991 the IBM PS/2 note was released as a successor.