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- Newsgroups: comp.arch
- Path: sparky!uunet!usc!rpi!utcsri!utzoo!henry
- From: henry@zoo.toronto.edu (Henry Spencer)
- Subject: Re: What's in a name?
- Message-ID: <Brz143.3EM@zoo.toronto.edu>
- Date: Sun, 26 Jul 1992 00:52:48 GMT
- References: <1992Jul17.220112.20995@microsoft.com> <1992Jul20.092822.7666@spool.cs.wisc.edu> <MKAHN.92Jul22092527@hopi.sedona.intel.com> <1992Jul25.075130.7192@spool.cs.wisc.edu>
- Organization: U of Toronto Zoology
- Lines: 28
-
- In article <1992Jul25.075130.7192@spool.cs.wisc.edu> mfrank@wilma.cs.wisc.edu (Matt Frank) writes:
- >Both the Apple ][ and Mac are examples of non backwards compatible products
- >enjoying great success. So are CD players. Although it was before my time,
- >aren't CP/M, minicomputers, DB2 and UNIX other examples?
-
- Some of these examples aren't really backward compatibility, because there
- was no previous base to be compatible with. Minicomputers, for example,
- mostly went into applications or organizations that had never been
- computerized before. It wasn't that common to see applications moved off
- mainframes onto minis (although it did happen).
-
- CDs are a good example of the basic rule for breaking backward compatibility:
- it has to be worth it. A quick rule of thumb is that an incompatible system
- has to be an order of magnitude better to convince most people to convert.
- Incremental improvements aren't enough. CDs give better sound, yes, but
- most people were reasonably happy with the sound from a good turntable.
- CDs won because they have better sound, *and* they don't wear out, *and*
- their physical form is more convenient, *and* they hold more, *and*
- neither they nor their player needs much in the way of cleaning or regular
- replacement, *and* you don't have to flip them over halfway through, *and*
- they make convenient and powerful digital remote controls easy. None of
- these things by itself is an order of magnitude, but the combination is.
-
- If you want to see bad backward-compatibility constraints, look at the
- phone system.
- --
- There is nothing wrong with making | Henry Spencer @ U of Toronto Zoology
- mistakes, but... make *new* ones. -D.Sim| henry@zoo.toronto.edu utzoo!henry
-