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From: phil@sivax.UUCP
Newsgroups: net.micro.mac
Subject: Re: Mac+ Architecture Diff?
Message-ID: <294@sivax.UUCP>
Date: Thu, 17-Jul-86 13:13:23 EDT
Article-I.D.: sivax.294
Posted: Thu Jul 17 13:13:23 1986
Date-Received: Fri, 18-Jul-86 23:49:32 EDT
References: <69600011@uiucdcsb> <12303@amdcad.UUCP> <112@crystal.UUCP>
Organization: System Industries, Milpitas, Ca
Lines: 30

> Has anyone seen ANY 1Meg SIMMs?  Oki is selling 256K ones for around double
> the chip price, but said a month ago that they didn't have 1Meg yet.
> 
> MacMemory has a real screwball scheme of 256K chips wired up to look like
> 1Meg modules; they also claim that you need a daugther board, which DOES NOT
> sound reasonable.
> 
> The 2 Meg MacMemory kits go for 475 or so, I hear, the 2.5 Meg are more.
> I'd really like to upgrade my Mac+ memory, but not with some baling-wire-and-
> spit contraption...
> 
The MacMemory enhancement called MaxPlus ENHANCED is not a BAILING wire
contraption.  It is 2 meg of SIMMS  (2 x 1meg Simms) using 256K chips.  I do
not know about their regular 1 meg boards, you are probably right, since they
told me that they 'modify the apple memory architecture slightly' and the
original ones ARE NOT internal HD compatible, the Enhanced are.  You use 2
1 meg simms, and 2 256k simms, giving 2.5 meg.

You could use 4 1meg simms,  to get 4 meg, but it exceeds apples power
supply limits (Darn Apple, developing a power supply EXACTLY right for a closed
machine architecture, the Mac+ should have also enhanced the power supply).

MacMemory is working on, and has prototypes of 1meg Simms using 1meg chips, but
the cost at this time is prohibitive due to chip prices.

I am not affiliated with MacMemory except for OEMing their products starting
next week, but it does get me the 'straight scoop'.

Phil Hunt
..ucbvaX!CALMA!SIVAX!PHIL