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Re: [Gnu-arch-users] tla1.2 on cygwin

From: Florian Weimer
Subject: Re: [Gnu-arch-users] tla1.2 on cygwin
Date: Thu, 4 Mar 2004 09:46:21 +0100
User-agent: Mutt/

Adrian Irving-Beer wrote:

> On Tue, Mar 02, 2004 at 08:38:47AM -0800, Tom Lord wrote:
> >     > Well, Windows NT and descendants aren't directly derived from DOS.
> > 
> > Yes, I know (although, don't they still contain some compatability
> > code or is that gone by now?).
> Well, NT is/was an OS/2 kernel with a Windows GUI.

Not quite correct, NT was OS/2 3.0, which was never released as OS/2.
Only in the early design phase, the system went as OS/2 3.0, before the
IBM/Microsoft schism.

> I believe the core of the OS/2 kernel was 'personalities' -- one
> personality when talking to DOS programs, one when talking to another
> class of programs, etc.

OS/2 never had such features.  But NT has a hardware abstraction layer,
several core kernel services, and subsystems built on top of that.

> Hence, NT actually had fairly good compatibility with DOS programs
> because it was like an early, more tightly-integrated VMware.

This is not true, compatibility with DOS programs is extremely poor,
actually much worse than Windows 95 (or Windows 3.1).

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