Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!sdd.hp.com!hplabs!hpcc05!col!hpldola!hp-lsd!davem
From: davem@hp-lsd.COS.HP.COM (Dave K. Martin)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: 256K simms on an Amiga?
Message-ID: <19620010@hp-lsd.COS.HP.COM>
Date: 8 Jan 91 15:00:03 GMT
References: <wbV=JRy00WB3MFqGUd@andrew.cmu.edu>
Organization: HP Logic Systems Division - ColoSpgs, CO
Lines: 20

The 8-up board from Microbotics will use 256k simms but only if you have the 
early 'A' model board.  The later 'B' model (revision?) board accepts only dip 
memory chips.  The other thing to look for is the type of simm modules that 
you have.  By far, the most common are the 256x9 simm modules where there 
are 8 data chips and 1 chip used for parity checking.  This is the type used 
in IBMs and their thousands of clones.  This type cannot be used by the 8-up 
board (or any other Amiga expansion device I believe) as the Amiga does not 
use the parity checking.  The 8-up boards use 256x8 or 1mx8 simm boards like 
are used in the Macs.  Microbotics also makes a small board where you can 
plug in individual dip chips in then the whole board plugs into the simm 
sockets on their 8-up board.

If you have the correct simm's, I don't think you could go wrong with an 8-up 
board.  I've had my A model with 4-megs in the pop-simm boards for some time 
and it has caused no problems of any kind (except the expense of populating 
it :) ).  The other boards are probably just as good but I don't have any 
experience with theem.


Hope this helps.....