Re: How do I get this to work??

[robert_dewar@my-dejanews.com]

In article <369850a6.31871728@news.pacbell.net>,
  tmoran@bix.com (Tom Moran) wrote:
> Sorry, I was trying to correct your apparent impression
> that segmented architectures started with the 286.  The
> closest to an Ada compiler I ever had for a Burroughs
> machine was a simple little toy one I wrote in the early
> 80's on a B6700, but the B5500 of course had segments
> over 15 years earlier.  See the book by Elliot Organick
> for more info.


A couple of postscripts here

First of all, you surely mean the 8086 rather than the 286
in the above. The segmentation model for the x86
architectures was present in the 8086, and the 286
protected model is simply an adaptation of this original
segmentation model.

Second, the whole point is that the 8086 segmentation did
NOT derive from the historical thread exemplified by the
Burroughs architecture. I would not be surprised if Steve
was unaware of this architecture (I will ask him next time
I talk to him). It came out of completely different
requirements, and really it is only the word "segmentation"
that the 8086 and the B5500 have in common, especially with
regard to the 8086. You could if you did not know better
regard the 80386 model as coming from the B5500 thread of
thought, but you would be wrong, any similarity is purely
accidental, since the 80386 derived directly from the 80286
which came from the 8086, each step being the result of
asking "how can we address more memory?" [1 meg on 8086,
16 megs on 80286, 4 gigs on 386]

Robert Dewar

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