Re: 16 Meg limit in 1.2?

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Article #482

#482

From: Alistair BANKS
Date: Fri, 13 Apr 1990 17:52

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OS/2 1.2 is a 286 operating system, and uses the 386
only as a fast 286, with superior mode switching
capabilities for faster dos mode support.

In addition it will swap the full 32 bit width of the
386 registers, not just the 16 bit width as in os/2
1.1 & 1.0. This allows application writers to use 32
bit registers for faster math, and allows device driver
developers to use 386/486 features.

Beyond that os/2 1.2 makes no further use of 386/486
specific features.

OS/2 2.0 will use the Virtual 8086 feature of the 386/486
for its multiple dos application support and will use the
32-bit offset capability of the 386/486 for its 32 bit
application support. It also makes extensive use of the
'wider' reach to data to significantly increase system
limits, including total physical memory, threads,
PM window handles and DCs.

As metioned before, OS/2 2.0 is available through a 
pre-release program (SDK) by calling 1-800-227-4697.

Alistair Banks
OS/2 Group
Microsoft

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!microsoft!alistair
From: alistair@microsoft.UUCP (Alistair BANKS)
Newsgroups: comp.os.os2
Subject: Re: 16 Meg limit in 1.2?
Keywords: os/2 1.2, 16megs
Message-ID: <54075@microsoft.UUCP>
Date: 13 Apr 90 17:52:22 GMT
References: <221@caslon.cs.arizona.edu>
Reply-To: alistair@microsoft.UUCP (Alistair BANKS)
Distribution: na
Organization: Microsoft Corp., Redmond WA
Lines: 27

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