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Article #4995Re: Parity vs. non-Parity RAM in the Mac IIci
From: Chuq Von Rospach
Date: Thu, 21 Sep 1989 22:42
Date: Thu, 21 Sep 1989 22:42
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>Does anyone know what the difference between parity and non-parity RAM is in >the Mac IIci? Does it have to do with the speed of the RAM? Does one type >run faster than the other or is it that one is more reliable??? Parity RAM is 9 bit ram SIMMS (and support hardware) instead of 8 bit ram SIMMS. Parity RAM is more expensive, not any faster and somewhat more reliable, although RAM reliability is high enough these days that unless you're writing RFC's for government contracts or totally paranoid, not terribly useful. All parity does is check to make sure that the eight bits you wrote into the RAM come out again the same way (but only if you flip one bit. Parity doesn't cover multi-bit errors. You need ECC to do that). There's no reason why a 'normal' user needs parity unless their applications require extremely high reliability. -- Chuq Von Rospach <+> Editor,OtherRealms <+> Member SFWA/ASFA chuq@apple.com <+> CI$: 73317,635 <+> [This is myself speaking. I am not Appl Segmentation Fault. Core dumped.
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!watmath!att!tut.cis.ohio-state.edu!brutus.cs.uiuc.edu!apple!chuq From: chuq@Apple.COM (Chuq Von Rospach) Newsgroups: comp.sys.mac Subject: Re: Parity vs. non-Parity RAM in the Mac IIci Message-ID: <34935@apple.Apple.COM> Date: 21 Sep 89 22:42:04 GMT References: <0xe23@deimos.cis.ksu.edu> Organization: Life is just a Fantasy novel played for keeps Lines: 22