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From: lee@mrmoose.wbst128.xerox.com (Lee Moore)
Newsgroups: comp.sys.mac,comp.graphics,comp.arch
Subject: Re: New RISC Graphics for Macs (and other Quest's)
Message-ID: <329@spot.wbst128.xerox.com>
Date: 22 Mar 90 16:21:15 GMT
References: <29560@amdcad.AMD.COM> <22297@watdragon.waterloo.edu> <7324@goofy.Apple.COM>
Sender: news@spot.wbst128.xerox.com
Reply-To: lee@mrmoose.UUCP (Lee Moore)
Organization: Xerox Webster Research Center, Webster, NY, USA
Lines: 22

In article <7324@goofy.Apple.COM> dwb@archer.apple.com (David W. Berry) writes:
>In article <22297@watdragon.waterloo.edu> nrjwong@lion.waterloo.edu () writes:
>>From the Mac IIfx press release:
>>What are Mac IIfx-specific DRAMs? Are they just faster? What speed
>>SIMMs(I assume SIMMs are still being used) should one stick into a IIfx?

According to "Apple Direct", March 1990, page 11, upper right hand corner:

"Are you wondering whether or not your current SIMMs will work in the
Macintosh IIfx?  Unfortuately, the answer is definitive no.  The new SIMM design
has separate RAM data input and output lines; this allows the memory
to run much faster (see main text), but it also necessitates a new
physical design to add the extra lines to the connector."

"The Macintosh IIfx works only with 1-Mbit or higher chips.  This means that
the computer cannot contain odd memory configuratoins such as 1, 2, and 5MB, 
all of which use the less-dense 256-Kbit chips."


Lee Moore -- Xerox Webster Research Center -- +1 716 422 2496
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