Path: utzoo!utgpu!attcan!uunet!convex!killer!ames!mailrus!husc6!rutgers!att!whuts!homxb!mto
From: mto@homxb.UUCP (M.ODONNELL)
Newsgroups: comp.sys.mac
Subject: Re: 4 Meg-SIMMs
Summary: Does this mean 2 Meg-SIMMs won't work
Message-ID: <1977@homxb.UUCP>
Date: 29 Jul 88 14:48:58 GMT
References: <563@ethz.UUCP> <4754@pasteur.Berkeley.EDU>
Organization: AT&T Bell Laboratories, Holmdel
Lines: 23

> >   parts. If it doesn't find them, the next lower MB (KB) SIMMs are searched
> >   for (16MB -> 4MB -> 1MB -> 256KB).
> >-  Then, the second 4 SIMMs are checked if there are the same SIMMs as in the
> >   first four rows or if there are lower parts installed.

> It's my understanding that 4MB parts are at the top of that loop, and not
> 16MB; making the max you could go directly on the motherboard 32Meg.  But
> I haven't poked around the Mac Family Hardware Ref. manual in a few months
> and might well be wrong on this one.

> leaving something not much over 8 Meg left (again, I haven't been sniffing

Does this mean that when (hopefully relatively cheap) 2M X 1 bit chips are
available (really 4M X 1s that are "half bad") that they can't be 
recognized?  

This may sound picky, but I understand that there have been serious 
yield problems with 4M chips.  If that continues into production, there
may be alot of 2Ms around until the problems are straightened out.  With
the way the "RAM cycle" is slowing down, that period may last a while.

Marty O'Donnell
ihnp4!homxb!mto