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- Newsgroups: comp.sys.prime
- Path: sparky!uunet!spool.mu.edu!yale.edu!jvnc.net!primerd.prime.com!bungee!jasonp
- From: jasonp@bungie.prime.com (Jason Pascucci)
- Subject: Re: X Windows on 50-Series
- Message-ID: <1992Dec23.214832.29949@primerd.prime.com>
- Sender: jasonp@bungee (Jason Pascucci)
- Organization: Prime Computer R&D
- References: <9212091722.AA28848@usenet.rpi.edu> <DRAND.92Dec10100134@spinner.osf.org> <1h1muqINN1e4@werple.apana.org.au> <1992Dec21.021714.26320@primerd.prime.com> <1h9e2jINNkht@werple.apana.org.au>
- Date: Wed, 23 Dec 1992 21:48:32 GMT
- Lines: 38
-
- In article <1h9e2jINNkht@werple.apana.org.au>, markd@werple.apana.org.au (Mark Delany) writes:
- |> jasonp@bungie.prime.com (Jason Pascucci) writes:
- |> But I don't think anyone seriously argues that a segmented model is
- |> more convenient for the programmer than flat address space (how the
- |> H/W provides this along with memory protection etc, is its business).
-
- You don't see me arguing, either. However, a segmented memory model
- isn't that hard on a programmer, compared to some other design
- atrocities that have existed...you just have to keep it in mind
- at times.
-
- |> On a tangent, you may want to see the old discussions re 64-bit
- |> addressing in comp.arch, one suggestion was that every data bit in the
- |> universe would be potentially visible in one huge address space! The
- |> mind boggles really.
-
- Yup, but I believe it was decided you need a little more than 64 bits.
- I think I posted my suggestion of 128 bit addressing, using a few
- bits (16?) for tag. (First, you stick your IP address on the top...:)
-
- |> Something I've always wanted to know is why the port of Unix to
- |> 50-series was canned (and I don't mean PRIMIX, I mean the genuine
- |> article). Now what was that project called? Here are my three guesses:
- |> performance, politics and (you guessed it) segmentation.
-
- Given these three issues, why should Unix ever have made it
- to the Intel architecture? I think the problems were a little
- more deeply rooted technically, although I'm sure it was very
- political. The DTAR setup and Ring protection scheme
- seem to me the more likely to be the last nails in the coffin.
-
- |> --
- |> Mark Delany markd@werple.apana.org.au
-
- --
- Jason R. Pascucci
- jasonp@primerd.prime.com
- Disclaimer: My above opinions do not necessarily reflect CV policy.
-