Using PC Memory In Macs (and Vice-versa)
Subject: Re: parity RAM in Macs Date: Wed, 28 Oct 98 20:04:56 -0500 From: Adam Powers <email@example.com> To: "Classic Posts" <firstname.lastname@example.org> The moderator wrote: > There are mixed reports as to whether parity SIMMS work in normal >Macs (which are non-parity.) And there definitely are mixed results when trying to use parity SIMMs in Macs. I now have a few interloping PCs in my mostly-Apple computer stash, and I've had some interesting experiences with 30-pin SIMMs. The obvious holds true: eight-chip (or two, or four) non-parity SIMMs will not work at all in PCs that require parity RAM; but most (NOT all) parity RAM works just fine in Macs. I have some three-chip 1 MB SIMMs that work properly in a Gateway 386sx, but show up as blanks in a IIsi - no sad Mac, but only the 1MB on the motherboard appears in the "About this Macintosh" window! I also have some PC SIMMs which generate Sad Mac RAM errors if and only if they are paired together - that is, if I use one of these SIMMs with a regular non-parity Mac SIMM, it works; if I use two (or more) in a bank of four, I get a Sad Mac. All the nine-chip 1MB 30-pin SIMMs I tried worked fine. I remember hearing something about "fake parity" SIMMs in the PC world a while back, about the time that the low-chip count SIMMs were hitting the market, perhaps that's the problem? I also recall warnings about using low chip-count SIMMs in the SE and Plus as well. At least all my computers are old enough that I needn't worry about 3.3v vs. 5v!
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