OS/2

IBM OS/2
Logo
Screenshot
DeveloperIBM, Microsoft (1.x)
Source modelClosed source
Initial releaseOS/2 1.0
(December 1987)
Latest releaseOS/2 Warp 4.52
(December 2001)
Supported platformsx86, PowerPC, NEC PC-9801
Kernel typeHybrid
User interfaceWorkplace Shell
LicenseProprietary

OS/2 (Operating System/2) was an operating system originally developed jointly by Microsoft and IBM, in development was codenamed "CP/DOS". Between the release of Windows 3.0 and OS/2 1.3, Microsoft stopped all cooperation with IBM, due to a feud between the companies' significantly different cultures and visions. IBM later on handled the development of the operating system by itself.

OS/2 have features like a virtual DOS machine, the WinOS/2 subsystem (Windows 3.0/3.1x inside OS/2), Presentation Manager, and more.

Microsoft later used OS/2 code to develop Windows NT 3.1. OS/2 code was later used by Serenity Systems to develop eComStation in 2001, which in turn was used by Arca Noae LLC to develop ArcaOS in 2017.

NEC sold a port of the Japanese localized version for their PC-9801 series of computers. This port features NEC copyrights as well as IBM and/or Microsoft copyrights along with NEC's own modified version of DOS.

Timeline[edit | edit source]

OS/2 Classic versions

Name Version Codename Release date Notes
OS/2 1.0 1.0 CP/DOS 1987-12 First version of OS/2 released without GUI
OS/2 1.1 1.1 Trimaran 1988-10 First version with the Presentation Manager
OS/2 1.2 1.2 Sloop 1989-10 Updated UI to resemble Windows 3.0
OS/2 1.3 1.3 Cutter 1990-12 Last version to be sold through Microsoft
OS/2 2.0 2.0 Cruiser 1992-04 First version to include WIN-OS/2 with Windows 3.0; replaced Presentation Manager with Workplace Shell
OS/2 2.00.1 2.00.1 Riker 1992-10
OS/2 2.1 2.1 Borg, Yawl 1993-05 Updated Windows version of WIN-OS/2 to 3.1
OS/2 2.11 2.11 N/A 1994-02
Legend:
Old version
Older version, still supported
Current stable version
Latest preview version
Future release

OS/2 Warp versions

Name Version Codename Release date Notes
OS/2 Warp 3 3.0 Warp 1994-10 Introduces Launchpad; only version to support PPC-based systems
OS/2 Warp 4 4.0 Merlin 1996-09-25 Replaced Launchpad as default shell with WarpCenter
OS/2 Warp Server for e-Business 4.5 Aurora 1999-04
OS/2 Warp 4.51 4.51 MCP/ACP 2000-11
OS/2 Warp 4.52 4.52 MCP2/ACP2 2001-12 Last version of OS/2
Legend:
Old version
Older version, still supported
Current stable version
Latest preview version
Future release