Am 14 Nov 2003 22:34 meinte Fred N. van Kempen:
> On Fri, 14 Nov 2003, Hans Franke wrote:
> > Because the relation between the segments are none of the
> > business of a user programm?
> That depends, Hans.. sometimes you just want to allocate a chunk
> of, say, 80KB. Which spans the segment boundaries. That is OK,
> but the user program *must* know about that.
I think we're closing in to the point where some of
the missunderstandings come from:
In a 16 Bit CPU, there's no such thing as an 80 K block.
Take a PDP 11, 28K words, that's it, if I have to handle
80K Bytes, I have to do it a chunk at a time, and the
same is true at the 8086, 64K at a time.
The advantage to any non segmented 16 Bit CPU is that I
may be able to just request two 40K Segments and fill
them with my 80K of data at the same time.
I still don't leave the 16 Bit sphere but have more
than one 16 Bit address space at the same time. That's
what I loved at the 8086 compared to other 16 Bit CPUs.
Gruss
H.
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Received on Fri Nov 14 2003 - 15:49:52 GMT