No, it was application-level, and AFAIR it required the applications not
to be too greedy about what they do. I think that what you describe now
isn't possible without introducing some form of (expensive) emulation to
avoid the different systems to fight for shared resources. At the very
least it would require an emulation of a different BIOS for each instance.
I wonder how far one could get with just an emulated 8086 core, 640K of
mapped memory and a simulated BIOS. Perhaps it could run some early
MDA-compatible software that was made before the "use hardware directly"
era.
Mateusz
On 02/09/2020 16:08, ZB wrote:
On Wed, Sep 02, 2020 at 03:56:26PM +0200, Mateusz Viste wrote:
https://en.wikipedia.org/wiki/DESQview
Indeed I recall that name - but somehow never used it before. Does it do
exactly what I've described? Like - for example - I could "split" 486 into
four x86 CPUs, then I can use one instance to boot FreeDOS there, the second
one to boot DOS 6.22 (for comparison), the third one for, say, DR-DOS etc.
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