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- Newsgroups: alt.folklore.computers
- Path: sparky!uunet!wupost!zaphod.mps.ohio-state.edu!rpi!news.columbia.edu!watsun.cc.columbia.edu!lasner
- From: lasner@watsun.cc.columbia.edu (Charles Lasner)
- Subject: Re: ASSEMBLY LANGUAGE IBM
- Message-ID: <1992Nov20.045846.18835@news.columbia.edu>
- Sender: usenet@news.columbia.edu (The Network News)
- Nntp-Posting-Host: watsun.cc.columbia.edu
- Reply-To: lasner@watsun.cc.columbia.edu (Charles Lasner)
- Organization: Columbia University
- References: <BxtpIv.AMD@mentor.cc.purdue.edu> <STEVEV.92Nov17104240@miser.uoregon.edu> <1992Nov18.134855.28580@geovision.gvc.com>
- Date: Fri, 20 Nov 1992 04:58:46 GMT
- Lines: 40
-
- In article <1992Nov18.134855.28580@geovision.gvc.com> pt@geovision.gvc.com writes:
- >stevev@miser.uoregon.edu (Steve VanDevender) writes:
- >
- >>I suspect that the questions apply to IBM's most famous series of
- >>machines, the 360/370 series. If you thought them placing
- >>increasingly souped-up versions of the 8088 in IBM PCs was bad,
- >>note that the 360/370 series has been using the same instruction
- >>set and processor architecture for nearly _30 years_. IBM's
- >>top-end mainframes (like the 3090) still run IBM 360 programs in
- >>binary form.
- >
- >From this I infer that you consider it a ``bad thing'' that an IBM mainframe
- >(or PC) user can upgrade his hardware without buying new versions of commercial
- >software?
-
- All that was stated is that the binary object modules of older programs can
- be made to run on the new machine. In practice, this may be inadequate
- depending on what the newer model actually has available on it. Moreover,
- IBM has tended to proliferate excessive versions of their O/S on these
- machines, as if they actually were separate and incompatible. Those of
- us used to either a relatively limited number of say VMS or unix variants
- don't appreciate the extraneous nature of artifically distinct O/S variants
- sold as separate entities. This tends to make one rethink the worth of
- staying with a family of machines where you actually do have to keep buying
- what is substantially the same software again and again without the means
- to recycle it.
-
- In the early 370 days, IBM had a campaign to extraneously introduce 370-only
- instructions into major components of O/S, so that they couldn't run on
- 360's. Various users distributed patches to remove the extraneous
- dependancies, so that purchased versions of O/S 370 could run on high-end
- 360's that were otherwise viable. IBM wanted them plowed under and then
- make the customer buy the latest and the greatest. But companies such
- as ITEL were refurbishing 360's and making them have new buss peripherals,
- so it was necessary to keep the software compatible in spite of IBM's
- attempts at planned obsolescence, and what effective amounts to restraint of
- trade in this situation (by making ITEL's product less attractive since it
- was claimed to only run obsolete versions of the software, etc.).
-
- cjl
-