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000267_arne@vajhoej.dk_Fri Jan 1 17:32:50 2010.msg
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Path: reader1.panix.com!panix!newsfeed-00.mathworks.com!news.tele.dk!feed118.news.tele.dk!dotsrc.org!filter.dotsrc.org!news.dotsrc.org!not-for-mail
Date: Thu, 31 Dec 2009 21:25:48 -0500
From: =?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
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Newsgroups: comp.protocols.kermit.misc,comp.os.vms
Subject: Re: Kermit on Itanium VMS
References: <dbb54db7-4384-41f5-863a-5b9b579ab87b@s31g2000yqs.googlegroups.com> <41039cdf-a708-489b-8146-986ec706ab5e@p8g2000yqb.googlegroups.com> <9c86a820-511f-4219-aecf-cfd31d9bdbcb@j4g2000yqe.googlegroups.com> <f14854cc-1cae-4b12-8457-f5fcb2c4495b@g26g2000yqe.googlegroups.com> <b901cbf2-227d-4e87-98cf-5e5b08f0be24@g7g2000yqa.googlegroups.com> <4a0e79e9-b366-43c7-a66f-6099a5c5b3a9@v25g2000yqk.googlegroups.com> <slrnhjkm10.odu.fdc@panix1.panix.com> <hhdm0s$eil$5@naig.caltech.edu> <CkTD8HhjfW7c@eisner.encompasserve.org> <7q4ng6F3u28giU1@mid.individual.net>
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On 31-12-2009 17:39, Bill Gunshannon wrote:
> In article<CkTD8HhjfW7c@eisner.encompasserve.org>,
> koehler@eisner.nospam.encompasserve.org (Bob Koehler) writes:
>> In article<Qrmdnbi9nf6YIabWnZ2dnUVZ_jxi4p2d@giganews.com>, "Richard B. Gilbert"<rgilbert88@comcast.net> writes:
>>> Err. . . How about RSX images in compatibility mode on a VAX 11/780 or
>>> 11/750?
>>>
>>> After all these years I have a little difficulty imagining why anyone
>>> would want to but given sufficient incentives it's possible to do it.
>>
>> Is the RSX AME still supported under 7.3?
>>
>> If so, then, yes, it may be possible to run a 40 year old binary
>> on the latest VMS for VAX.
>>
>> But that depends on the definition of "run". The AME added
>> compatability mode emulation when the first VAXen without
>> compatability mode shipped. I'm fairly sure you could also get
>> 40 year old images to run on SIMH on just about any platform.
>>
>> So if I have SIMH simulating a PDP-11 on an Itanium, am I "running"
>> 40 year old images on the latest VMS for Itanium?
>>
>> Or do we require hardware execution of the instructions to at least
>> the extent that VAX-11 series microcode implemented compatability
>> mode instructions?
>
> And, once again, people here have completely missed the point. IBM
> (and I am pretty sure UNISYS) have maintained that compatability from
> the very beginning with no breaks in between. We are not talking about
> someone coming along after the fact and writting an emulator but the
> original company thinking that backwards compatability was necesary
> enough to build it into their products even after the original
> hardware ceased to exist. We are not talking about "VESTING", we
> are talking about just plain running old programs.
DEC could have kept PDP-11 compatibility mode in all VAX'es and have
added both PDP-11 and VAX compatibility modes to Alpha.
But I doubt that it would have been worth the cost.
The VMS market is not like the IBM mainframe market.
And UNISYS is mostly selling services and x86-64 servers with
Windows and Linux today.
Arne