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Article #26651Re: Indivisible R-M-W cycles on the Mac ][
From: Matt Dillon
Date: Tue, 22 Mar 1988 20:30
Date: Tue, 22 Mar 1988 20:30
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>IMV-5 warns against the use of the 68K TAS instruction saying that the >read-modify-write memory cycle is not supported by the Mac ][ and SE >hardware. Does anyone out there know why and to what extent this is true? Probably the same reason you can't do it on the Amiga ... it mucks with the custom support hardware's timing. >I am bothered by this since indivisible RMW cycles are important to the >implementation of multi-processor/task architectures. Not as important as you think, though definately convenient. -Matt
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Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!CORY.BERKELEY.EDU!dillon From: dillon@CORY.BERKELEY.EDU (Matt Dillon) Newsgroups: comp.sys.mac Subject: Re: Indivisible R-M-W cycles on the Mac ][ Message-ID: <8803222030.AA28147@cory.Berkeley.EDU> Date: 22 Mar 88 20:30:43 GMT Sender: daemon@ucbvax.BERKELEY.EDU Lines: 12