Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!ncar!umigw!umiami!gross
From: gross@umiami.ir.miami.edu (Mondo)
Newsgroups: comp.sys.mac.hardware
Subject: Mac IIci 256K SIMMs - Bus errors!
Message-ID: <1990Nov12.103352.7375@umiami.ir.miami.edu>
Date: 12 Nov 90 14:33:52 GMT
Organization: Univ. of Miami - Info Resources
Lines: 28

I've never heard of this problem before, so I hope someone else has...

Whenever they sell Mac IIci's here, they add in an extra meg along with
the 4 MB that is comes with.  They use 256K SIMMs to get that extra meg.
Now the problem seems to be that whenever something tries to use that extra
meg, the Mac crashes with a bus error (ID=01, y'know, the one yer never
supposed to see :) ).

Now is there a certain speed that the 256K SIMMs need to be?  They've been 
using 80ns so far, and they do have a IIci with this configuration
up and running now, so they (and I) know it works.  Could it just be bad SIMMs?
They do pass the boot-up test.

Oh one more thing...I've heard that if the Mac IIci doesn't recognize the
extra meg, but it knows it has more than 4MB, it'll try and re-use the
first meg of memory again.  Is this true or am I just hearing things?

Thanks oodles.

-- 
Jason Gross     Comp Sci Ugrad     University of Miami     Class of '91 (?)
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Hey, wanna save the world? | Got sumtin' to say?        gross@umiami.bitnet
Nuke a Godless, Communist, | Pick and choose!     gross@umiami.ir.miami.edu  
gay whale for Christ.      |                      gross@miavax.ir.miami.edu
              - Anonymous  |                     jgross@umbio.med.miami.edu
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               The University of Miami has a lovely fountain.