Transcript OS2-by-Kevin-Koo-Kyu-Oh-Matt-Liberati-Stephanie-Engel-2002

OS/2
Kyu Oh
Kevin Koo
Matt Liberati
Stephanie Engel
History of OS/2
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Version 1
Version 2
Warp 3
Warp 4
Version 1
• Version 1.0 was released in 1987
– IBM and Microsoft produced OS/2 version 1.0
– Processor 286
• Version 1.1 was released in 1988
– Presentation Manager (PM)
• Version 1.2 was released in 1989
– Improved PM
• Version 1.3 was released in 1991 rectangle
– smaller, faster, and more stable than previous versions.
Version 2
• Version 2.0 was released in 1992
– first 32 bit operating system for
personal computers
– used Virtual DOS Machines (VDMs)
– Workplace Shell (WPS)
• Version 2.1 was released in 1993
– more CD-ROM and SCSI drivers
Warp 3
• Warp 3 was release in 1995
• Required 4 MB of RAM
• Improved Workplace Shell in
performance and functionality
• TCP/IP and Internet communications
Warp 4
• Warp 4 was released in 1996
• new features
– Java
– VoiceType Navigation
– Dictation
• “Universal Client” because of its
unparalleled network connectivity.
Today OS/2 Server
• Current version 4.51
• IBM product
• Runs on Intel, Cyrix, AMD pentium,
and Intel
• Cost $250
Semaphore
• What is it
• 3 Types
Scheduling
• Multitasking
• Priority Based
Deadlock
• Definition
• Situation
• Result
Graphical User Interface
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The Beginnings of OS/2
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OS/2 Warp 4
The Beginnings of OS/2
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OS/2 was originally written for the 286
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The first version of OS/2 was released in late 1987
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The command line interface of OS/2 1.0 looked a
lot like DOS
OS/2 1.0 had a number of important features that DOS did
not have - and which many other operating systems began
to support only many years later.
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Preemptive multitasking
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Multithreading
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Interprocess communication (IPC)
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Virtual memory support (swapping)
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Fully protected operation
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Dynamic linking (DLLs)
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Support for 16MB physical memory
In OS/2 1.0 there wasn't really much to look at. The interface was text only
screenshots from the OS/2 1.0 tutorial program
The worst obstacle that OS/2 faced was DOS support. This
was caused by a combination of several factors:
• No support for virtualization of real mode on the 286
processor.
• Seriously incomplete DOS API forcing applications to
access hardware directly.
• Memory constraints of real mode.
OS/2 Warp 4
• Released in August, 1996
• Its new features included a "beautified" GUI; an ex-Apple
programmer designed the new graphical icons
• A full Java Development Kit, which included
a Java Virtual Machine
• OS/2 Warp 4 is fully Object Oriented via SOM
• Pre-emptively multitasks all sessions (including DOS/Win)
• Faster than WinNT, more stable than Win95, easier to
use than both WinNT and Win95, it is safe proven
technology, it runs practically all of your DOS and
Windows 3.1 programs
OS/2 Warp 4 desktop with the WarpCenter and some Object Desktop's component
In OS/2 Warp 4, you can run practically all OS/2, Java, DOS, and Win 3.1 programs
all at the same time with no problem!
Characteristics
• OS/2 is a single-user operating
system
Uses pre-emptive multi-tasking to
schedule CPU time
•OS/2 was the first Personal Computer
to provide intrinsic multi-tasking
Multi-Threading
•Native applications can utilize multi-threading
capability
•Not legacy applications from DOS or
Windows 3.1
Differences
OS/2 allows for different AUTOEXEC.BAT
files to be set for different DOS applications
Lower end versions of OS/2 either:
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require for Windows 3.1 to already be installed
on the computer
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includes a re-compiled version of Win 3.1.