OS/2 Timeline 1987-1997

Here's a brief timeline of the first ten years of OS/2 history. Only the "client" versions are listed, that is no Extended Edition and Server versions. Moreover, the dates and features pertain to IBM versions of OS/2 1.x. The Microsoft OEM versions had slightly different release dates and feature sets.
 
Version Release date Comments
OS/2 1.0
(Codename: CP/DOS)		 December 1987
  • Joint IBM-Microsoft development
  • 16-bit protected mode OS
  • Required 80286, about 1.5MB RAM
  • Supported max 32MB partitions
  • Text mode interface only
  • Single DOS box support
  • FAT filesystem only
OS/2 1.1
(Codename: Trimaran)		 November 1988
  • Added graphical user interface - the Presentation Manager
  • Support for larger than 32MB partitions
OS/2 1.2
(Codename: Sloop)		 October 1989
  • Installable File System Support (IFS)
  • HPFS included
  • Revamped Presentation Manager
  • Dual Boot capability
  • Included REXX and IPF
OS/2 1.3
(Codename: Cutter)		 December 1990
  • Extensive performance tuning
  • Lowered resource requirements (2MB RAM minimum)
  • Support for ATM fonts
  • Developed by IBM without Microsoft's involvement
OS/2 2.0
(Codename: Cruiser)		 April 1992
  • 32-bit OS
  • Required 80386SX, 4MB RAM
  • Multiple DOS boxes
  • Win-OS/2 support
  • System Object Model (SOM support)
  • WorkPlace Shell (WPS) based on SOM used as GUI
  • Boot Manager
OS/2 2.1
(Codename: Borg)		 May 1993
  • 32-bit GRaphics Engine (GRE)
  • More CD-ROM and SCSI drivers
  • APM and PCMCIA support
  • MMPM/2 included
  • Win-OS/2 based on Windows 3.1
OS/2 for Windows
(Codename: Ferengi)		 November 1993
  • No Win-OS/2 - used pre-existing Windows 3.1 instead
  • New drivers for S3 based cards
OS/2 2.11 February 1994
  • Also available as ServicePak XR06200 for OS/2 2.1
  • Primarily bugfixes
OS/2 2.11 SMP June 1994
  • Symmetric MultiProcessing (SMP) support
  • Support for up to 16 CPUs
OS/2 Warp 3.0
(Codename: Warp)		 October 1994
  • Performance tuning, lower resource requirements
  • Compatible with Windows 3.11
  • Included BonusPak
  • More drivers for many device types
  • Included DSOM object model
  • Many WPS modifications
OS/2 Warp Connect May 1995
  • Included full networking support in base OS
  • Peer to peer functionality
OS/2 Warp, PowerPC Edition
 December 1995
  • Ran on PowerPC platform
  • Based on MACH microkernel
  • Never widely used or even sold
OS/2 Warp 4.0
(Codename: Merlin)		 September 1996
  • Included Java 1.01 runtime and JDK
  • VoiceType support