![]() The base configuration included 256 KB of RAM, expandable to 640 KB, dual 720 KB 3.5-inch floppy drives, and a monochrome, CGA-compatible LCD screen. The CPU is an Intel 80C88, the CMOS version of the Intel 8088 CPU. The other hardware specifications are largely the same for all three models. The Model 2 lacked a backlight as well but upgraded to an improved supertwist panel, and the Model 3 included a backlight. The original Convertible used a non-backlit panel which was considered difficult to read. The latter two were released in October 1987 and are primarily distinguished by their LCD panels. The PC Convertible came in three models: PC Convertible, PC Convertible Model 2 and PC Convertible Model 3. Another attempt in 1984 produced the "P-14" prototype machine, but it failed to pass IBM's human factors tests, especially after poor public reception of the display in the competing Data General-One. In 1983, work was underway on a laptop similar to the Tandy Model 100, codenamed "Sweetpea," but it was rejected by Don Estridge for not being PC compatible. IBM had been working on a laptop for some time before the Convertible. It was replaced in 1991 by the IBM PS/2 L40 SX, and in Japan by the IBM Personal System/55note, the predecessor to the ThinkPad. Like modern laptops, it featured power management and the ability to run from batteries. The Convertible was IBM's first laptop-style computer, following the luggable IBM Portable, and introduced the 3½-inch floppy disk format to the IBM product line. The IBM PC Convertible (model 5140) is a laptop computer made by IBM, first sold in April 1986. IBM PC DOS with custom icon-oriented shell interface
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