Path: utzoo!utgpu!watserv1!watmath!att!rutgers!sunybcs!ubvms.cc.buffalo.edu!pscchris
From: pscchris@ubvmsd.cc.buffalo.edu (Christopher Holoman)
Newsgroups: comp.sys.mac.system
Subject: Re: RAM Chip Speed?
Message-ID: <29984@eerie.acsu.Buffalo.EDU>
Date: 5 Jul 90 18:29:05 GMT
References: <1990Jul3.072826.1@mel.cipl.uiowa> <42654@apple.Apple.COM>
Sender: news@acsu.Buffalo.EDU
Reply-To: pscchris@ubvmsd.cc.buffalo.edu
Organization: University at Buffalo
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In article <26729@netnews.upenn.edu>, rubinoff@linc.cis.upenn.edu (Robert Rubinoff) writes...
>In article <42654@apple.Apple.COM> austing@Apple.COM (Glenn L. Austin) writes:
>>wolf@mel.cipl.uiowa writes:
>>[...]  However, the only restriction
>>is that all SIMMs within a bank (2/bank on Plus & SE, 4/bank on II-class, &
>>SE/30) are the same speed.
> 
>NO! NO! NO! NO! NO!
> 
>I'm really getting tired of seeing this wrong information repeated over and

[correction deleted] 


>This mistake is presumably a misunderstanding or misremembering of the correct
>restriction that all SIMMS within a bank must be the same *size*.  There is
>also a restriction on all Macs other than the IIci that if the two banks have
>different size SIMMS, the larger ones must go in the first bank.  (I think
>the "first" bank is always the one labeled Bank A, but I'm not sure.)

Well, I'll add my own correction, or clarification, here.  There is a lot
of confusion about SEs, which I have recently waded through, caused by
what is the "first" bank.  If you are upgrading to 2.5 megs, in an older
SE, with soldered resistors, the 1 megs go in what I would consider the 
first bank, since it's labelled SIMM 1 and SIMM 2.  BUT, in newer SEs, with
the jumper resistor, they must be in the bank labelled SIMM 3 and SIMM 4.

I suppose if you ignored the labelling, that bank could be considered "first"
since it is closer to the edge of the circuit board.

>I don't mean to criticize Glenn; he's probably just repeating what he was told.
>But I've seen this misinformation dozens of times, and I'm just getting tired
>of it.

Ditto.

>   Robert

Chris