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000274_M.Kraemer@gsi.de_Mon Jan 4 10:51:31 2010.msg
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Path: reader1.panix.com!panix!newsfeed-00.mathworks.com!fu-berlin.de!newsfeed01.sul.t-online.de!newsmm00.sul.t-online.de!t-online.de!news.t-online.com!not-for-mail
From: Michael Kraemer <M.Kraemer@gsi.de>
Newsgroups: comp.protocols.kermit.misc,comp.os.vms
Subject: Re: Kermit on Itanium VMS
Date: Sat, 02 Jan 2010 11:55:27 +0100
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Xref: panix comp.protocols.kermit.misc:15875 comp.os.vms:515935
Ken Fairfield schrieb:
> On Dec 29, 1:05 pm, Michael Kraemer <M.Krae...@gsi.de> wrote:
>
>>glen herrmannsfeldt schrieb:
>>
>>
>>>In comp.os.vms Frank da Cruz <f...@panix.com> wrote:
>>>(snip)
>>
>>>>VMS is one of the few surviving OS's that pays serious attention to the
>>>>now deprecated if not forgoteen concepts of stability and backwards
>>>>compatibility from one release to another, so any VMS / IA64 binary that
>>>>you find in the archive:
>>
>>>As I understand it, z/OS will still run OS/360 load modules, such
>>>as the PL/I compiler written and assembled over 40 years ago.
>>>I don't believe the VMS currently can run any binaries over 40
>>>years old.
>>
>>I wonder if it can run binaries 20 years young.
>>Or would a VAX binary of 1989 run on current Itanic hardware,
>>out-of-the-box?
>
>
> Assuming that's a serious question (is it? really?),
well, yes, at least partly.
The owners of VMS could have made the various
transitions as smooth as Apple, for example.
Invoking an extra translator is not as "out-of-the-box"
as the z/OS example, IMHO.
So VAX compatibility was "broken" after 14 years, in 1992,
when Alpha appeared and one had to switch if one wanted
more powerful VMS equipment. Alpha compatibility was
broken after another 14 years, in 2006 (latest),
when more powerful VMS equipment had to be Itanic based.
If you look at the competition, PA-RISC lasted about 20 years,
Sparc more than 20 years, and Power turns 20 this year
and may still have left a few more years of life.
In this sense VMS is one of the least backward compatible
platforms out there.