From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,86ec22e070e319c0 X-Google-Attributes: gid103376,public From: robert_dewar@my-dejanews.com Subject: Re: How do I get this to work?? Date: 1999/01/10 Message-ID: <77abmh$dg8$1@nnrp1.dejanews.com>#1/1 X-Deja-AN: 430859818 References: <76s0dp$1v4$1@nntp3.uunet.ca> <76tbvv$ba5$1@nntp3.uunet.ca> <36926c54.2583014@news.pacbell.net> <76uvjt$o0f$1@nnrp1.dejanews.com> <369308b4.42620270@news.pacbell.net> <771ash$rr3$1@nnrp1.dejanews.com> <36943353.31256483@news.pacbell.net> <7798bs$i9f$1@nnrp1.dejanews.com> <369850a6.31871728@news.pacbell.net> X-Http-Proxy: 1.0 x6.dejanews.com:80 (Squid/1.1.22) for client 205.232.38.14 Organization: Deja News - The Leader in Internet Discussion X-Article-Creation-Date: Sun Jan 10 13:58:42 1999 GMT Newsgroups: comp.lang.ada X-Http-User-Agent: Mozilla/4.04 [en] (OS/2; I) Date: 1999-01-10T00:00:00+00:00 List-Id: 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 -----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own