Re: Lisa OS preemptive multitasking and protected memory: myth or reality?

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From: Ray Arachelian <ray_at_email.domain.hidden>
Date: Mon, 18 Dec 2006 12:26:46 -0500

I did have memory protection and virtual memory via the MMU. I believe that the multitasking wasn't pre-emptive due to LisaGraf being non-reentrant, but I'm not 100% sure. (LisaGraf became QuickDraw on the Mac.)

Andrea wrote:
> Hello, there are many web pages stating that the Lisa had preemptive
> multitasking and protected memory, features that were going to become
> common on personal computers only with the more recent versions of
> Windows (> Windows 98) and OSX on Macs. Is this true or just a myth?
>
> >From <http://en.wikipedia.org/wiki/Apple_Lisa>
> "It is a common misconception that the Lisa OS used preemptive
> multitasking."
>
> I am more and more confused.
>
Received on 2006-12-18 12:26:48