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- From: ray@netcom.com (Ray Fischer)
- Subject: Re: Motorola's 68060 for the Mac
- Message-ID: <1993Jan24.195024.2321@netcom.com>
- Organization: Netcom. San Jose, California
- References: <2B5B923E.17057@news.service.uci.edu> <C12HIu.193@news.cso.uiuc.edu> <2B625370.27882@news.service.uci.edu>
- Date: Sun, 24 Jan 1993 19:50:24 GMT
- Lines: 24
-
- dan@cafws2.eng.uci.edu (Dan Harkless) writes ...
- > tinsel@uiuc.edu writes:
- >>128k ROMS, MultiFinder, System 7, and the '040 all broke some software, but
- > ^^^ ^^^^ ^^^^^ ^^^^ ^^^^^^^^
- >>publishers quickly responded with updates.
- >
- > Interesting. The first allusion I saw to this was the 040
- >"compatibility mode" rating in the Speedometer ratings article. I notice the
- >mode slows down the performance quite a bit. What's the nature of this
- >incompatibility? Was a lot of software affected? I plan to buy a Mac soon
- >and I need to choose between an 030 and 040.
-
- You're too late to the game to be worrying about it. The 68040 uses a
- significantly faster chaching scheme. When some programs used
- self-modifying code (always a bad practice) the new instructions would
- end up in the data cache instead of in RAM and the program would end
- up executing the wrong instruction. All current applications have
- fixed this problem and so it's pretty much a non-issue these days
- unless you're forced to run old software. For those programs there is
- a control panel which disables the caches.
-
- --
- Ray Fischer "Convictions are more dangerous enemies of truth
- ray@netcom.com than lies." -- Friedrich Nietszsche
-