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- From: eric.larson@f620.n2605.z1.ieee.org (eric larson)
- Newsgroups: comp.sys.mac.hardware
- Subject: 486 vs. Mac Benchmarks
- Message-ID: <20861.2B501EA2@zeus.ieee.org>
- Date: 10 Jan 93 00:21:03 GMT
- Sender: news
- Organization: FidoNet node 1:2605/620 - Shockwave Rid, Freehold NJ
- Lines: 23
-
-
- # In article <1992Dec23.144535.11341@crd.ge.com> davidsen@crd.ge.com (bill
- # davidsen) writes:
-
- ## The truth is that Mac applications are 32 bit, and DOS applications
- ##are 16 bit. A comparison of UNIX 32 bit applications would be more
- ##correct, if they were just comparing the processors.
-
- # Well, if this is so, how do the apps run on Mac Pluses? And why is
- # 32 bit adressing an option under System 7?
-
- The reason that these apps run on Mac Plusses is that the 68000 CPU has 32 bit
- registers.
-
- The reason for the "option" for 32 bit addressing is that versions of the OS
- prior to System 7 did not use the top 8 bits for memory addressing, and some
- enterprising but misguided programmers used this space for other purposes.
- Turning off 32 bit addressing in System 7 allows compatability with such
- brain-damaged (usually Microsoft) software.
-
- --
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- eric larson - Internet: eric.larson@f620.n2605.z1.ieee.org
-