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From: torrie@cs.stanford.edu (Evan Torrie)
Newsgroups: comp.sys.amiga.advocacy
Subject: Re: MegaMac
Message-ID: <1991Jun7.044953.3848@neon.Stanford.EDU>
Date: 7 Jun 91 04:49:53 GMT
References: <55538@nigel.ee.udel.edu> <91157.001511MBS110@psuvm.psu.edu> <16719@darkstar.ucsc.edu> <22231@cbmvax.commodore.com>
Sender: torrie@neon.Stanford.EDU (Evan James Torrie)
Organization: Computer Science Department, Stanford University, Ca , USA
Lines: 31

daveh@cbmvax.commodore.com (Dave Haynie) writes:

>Coprocessor slot can support up to 128MB of something (presumably memory) at
>full 68030 speeds.  Practically speaking, a Coprocessor slot card has enough
>room on it to get 128MB, but not with a 68040 there too.  Chances are, this
>slot get used for processor upgrades.

  How much physical space is there inside a 3000 for the coprocessor card?
Does it sit upright or lie on its side?
Just curious because the Radius Rocket (a Mac II form-factor NuBus card) 
manages to fit 8 SIMM sockets [enough for 128MB of RAM], a 68040, and
all the graphics acceleration hardware on a single board.

>The Zorro III bus has 1.75 GB ($10000000-$7fffffff) reserved for it in the 
>A3000 memory map.  The autoconfiguration mechanism support units as large as
>1GB each (you can have one of these).  In any case, using 4MBit ZIP DRAMs, you
>can realistically fit 64MB on a board.  If you went to 16MBit DRAMs, like used
>on those 16MB Mac SIMMs, you could fit 256MB per card.  Those chips do in
>fact exist, though they're considerably more expensive per MB than 4MBit parts.

  Definitely true.  A 16MB SIMM for the Mac which uses 16MBit DRAMs
retails for $7000.
  A 16MB SIMM using 32 x 4MBit DRAMs costs just $2200.



-- 
------------------------------------------------------------------------------
Evan Torrie.  Stanford University, Class of 199?       torrie@cs.stanford.edu   
"Lay me place and bake me pie, I'm starving for me gravy... Leave my shoes
and door unlocked, I might just slip away - hey - just for the day."