OS/2
/O S too/
IBM and
Microsoft's successor to the
MS-DOS operating system for
Intel 80286 and
Intel 80386-based microprocessors.
It is proof that they couldn't get it right the second time either.
Often called "Half-an-OS".
The design was so
baroque, and the implementation of 1.x so bad, that 3 years after introduction you could still count the major application programs shipping for it on the fingers of two hands, in
unary.
Later versions improved somewhat, and informed hackers now rate them superior to
Microsoft Windows, which isn't saying much.
See
second-system effect.
On an
Intel 80386 or better, OS/2 can multitask between existing
MS-DOS applications.
OS/2 is strong on connectivity and the provision of robust virtual machines. It can support
Microsoft Windows programs in addition to its own native applications.
It also supports the
Presentation Manager graphical user interface.
OS/2 supports
hybrid multiprocessing (HMP), which provides some elements of
symmetric multiprocessing (SMP), using add-on IBM software called MP/2.
OS/2 SMP was planned for release in late 1993.
After OS/2 1.x the
IBM and
Microsoft partnership split. IBM continued to develop OS/2 2.0, while Microsoft developed what was originally intended to be OS/2 3.0 into
Windows NT. In October 1994, IBM released version OS/2 3.0 (known as "Warp") but it is only distantly related to
Windows NT. This version raised the limit on RAM from 16MB to 1GB (like Windows NT).
IBM introduced networking with "OS/2 Warp Connect", the first multi-user version.
OS/2 Warp 4.0 ("Merlin") is a
network operating system.
(http://www.mit.edu:8001/activities/os2/os2world.html).
[Dates?]
[
Jargon File]
