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From: Rugxulo <rugxulo@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: DOS, was Re: Ada Tutor Web Site Shutting Down
Date: Sat, 14 May 2011 17:14:25 -0700 (PDT)
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Date: 2011-05-14T17:14:25-07:00
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Hi again,

On May 14, 4:29=A0pm, Rugxulo <rugx...@gmail.com> wrote:
>
> On May 14, 8:52=A0am, Yannick Duch=EAne (Hibou57)
>
> <yannick_duch...@yahoo.fr> wrote:
> > Le Fri, 13 May 2011 22:12:37 +0200, Rugxulo <rugx...@gmail.com> a =E9cr=
it:> TSRs? =A0:-) =A0 Novell DR-DOS 7 had true multitasking, but it needed =
a
> > > 386. The 286 could only do task switching
>
> > Pease, what difference do you see between "true multitasking" and "only=
 =A0
> > task switching" ? Did you meant preemptive vs cooperative ?
>
> http://en.wikipedia.org/wiki/Task_switching

Hmmmm, that wasn't quite what I meant. See below:

http://en.wikipedia.org/wiki/Computer_multitasking
http://en.wikipedia.org/wiki/DR-DOS

"DR DOS 6.0 also includes a task-switcher named TASKMAX, supporting
the industry standard task-switching API to run multiple applications
at the same time. In contrast to Digital Research's Multiuser DOS
(successor of Concurrent DOS in the multi-user products line), which
would run DOS applications in pre-emptively multitasked virtual DOS
machines, the DR DOS 6.0 task switcher would freeze background
applications until brought back into the foreground. While it runs on
x86-machines, it is able to swap to XMS memory on 286+ machines."