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- Newsgroups: comp.arch
- Path: sparky!uunet!sun-barr!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!jvnc.net!primerd.prime.com!hobbes!danw
- From: danw@hobbes.prime.com (Dan Westerberg)
- Subject: Re: What's in a name?
- Message-ID: <1992Jul21.040216.13502@primerd.prime.com>
- Sender: danw@hobbes (Dan Westerberg)
- Organization: Prime Computer
- References: <1992Jul16.005016.25778@microsoft.com> <l6bu58INN4d1@spim.mips.com> <1992Jul17.220112.20995@microsoft.com> <1992Jul20.092822.7666@spool.cs.wisc.edu>
- Date: Tue, 21 Jul 1992 04:02:16 GMT
- Lines: 54
-
- In article <1992Jul20.092822.7666@spool.cs.wisc.edu>, mfrank@wilma.cs.wisc.edu
- (Matt Frank) writes:
- >
- > Backwards compatability has always been a particular pet peeve of mine, so I
- > feel the need to add my two cents worth. I have two specific problems.
- >
- [Text on problems deleted]
-
- Backwards compatability is definitely a pain in the butt. I've spent the last
- 3 years designing a new CPU for a proprietary architecture (Prime 50 Series)
- that was originally a copy of a Honeywell machine from the early '70s.
-
- However, Prime Computer has a strict compatability policy; with some minor
- exceptions, code written for one of our machines 15 years ago will still run
- today! This makes a very strong selling point to our customers, who potentially
- have millions of dollars invested in our hardware/software. Also, it keeps me
- employed! :-)
-
- If we were to say to our customers that their software would no longer be
- compatible with a new machine, we would quickly lose our installed customer
- base. At that time, it would make sense for a customer to begin investigating
- the benefits/tradeoffs associated with switching operations to an alternative
- hardware platform (be it another proprietary system or a Unix system).
-
- So long as our hardware/software continues to perform the job expected by
- our customers, they will stay loyal to our product line, since upgrading means
- no down-time associated with training or porting of software/databases.
-
- From an architectural point of view, I would *love* to start with a clean slate
- and design a complete system with full flexibility of the instruction set and
- it's capabilities. However, the economics of the situation do not warrant such
- a bold move. I believe the original IBM PS/2 with the MicroChannel Architecture
- is an excellent example of abandoning an installed customer base.
-
- Just two cents worth from a CPU designer mired in backwards compatability. :-)
-
- Dan W.
-
- >
- > -Matt Frank (mfrank@cs.wisc.edu)
- > My opinions are my own and may not be those of my employer (or anybody else
- > for that matter).
-
- ditto on opinions :-)!
-
- --
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- ~ "These walls that still surround me ~ ~
- ~ Still contain the same old me ~ Dan Westerberg ~
- ~ Just one more who's searching for ~ danw@hobbes.prime.com ~
- ~ The world that ought to be" ~ ~
- ~ - Neil Peart ~ Prime Computer, Framingham, MA ~
- ~ ~ ~
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-