Timeline History of Operating System/2

By Hartmut Frommert

Timeline
1985   ADOS project

1985-1986   Developing versions called NEWDOS, DOS 5, DOS 286, Big DOS, CP/DOS, developed from DOS 3.2 and MT-DOS.

1987 December OS/2 1.0 SE. Announced with the PS/2 in April, and delivered in December 1987. 16-bit system for 80286 protected mode, multitasking, memory management, protection, dynamic linking, (incomplete) 16-bit API, DOS support

1988   OS/2 1.0 EE. Communications (SNA, X.25, LAN Manager), database (Query manager, SQL)

1988   OS/2 1.1 SE. Presentation Manager (PM)

1989   OS/2 1.1 EE. Remote database

1989   OS/2 1.2 SE. High Performance File System (HPFS), Installable File System (IFS)

1990   OS/2 1.2 EE. Better PM, TCP/IP and Ethernet

1990   OS/2 1.3 SE.

1991   OS/2 1.3 EE.

1992 March OS/2 2.0. First 32-bit system. 32-bit API, paging, Workplace Shell (WPS). Multiple DOS (and Windows 3.x) sessions. OS/2 2.1. OS/2 for Windows. OS/2 2.11.

1994   OS/2 Warp 3.

1995   OS/2 Warp Connect 3.

1996 November OS/2 Warp 4. Warp Server. eComstation 1.0. eComstation 1.1.