From the start, there were 3 planned editions of OS/2. 1.x - 16-bit, for the 80286 2.x - 32-bit, for the 80386 3.x - 32-bit, portable and CPU-independent, ai

From the start, there were 3 planned editions of OS/2. 1.x - 16-bit, for the 80286 2.x - 32-bit, for the 80386 3.x - 32-bit, portable and CPU-independent, aimed at RISC chips. MS also had a multitasking DOS 4, never fully commercially released. https://en.wikipedia.org/wiki/MS-DOS_4.0_(multitasking) https://en.wikipedia.org/wiki/MS-DOS_4.0_(multitasking) http://www.os2museum.com/wp/multitasking-ms-dos-4-0-lives/ http://www.os2museum.com/wp/multitasking-ms-dos-4-0-lives/ What became NT started out as OS/2 3. It was initially developed on the Intel i860 RISC chip, codenamed N10. OS/2 3 was codenamed OS/2 NT for N-Ten.