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From: grayd@jove.cs.pdx.edu (David R. Gray)
Newsgroups: comp.sys.atari.st
Subject: 520 upgrade/schematics
Message-ID: <1709@psueea.UUCP>
Date: 15 Sep 89 06:01:33 GMT
Sender: news@psueea.UUCP
Reply-To: grayd@jove.cs.pdx.edu (David R. Gray)
Distribution: usa
Organization: Dept. of Computer Science, Portland State University; Portland OR
Lines: 14

Hi! I'm new to the net.  I have this burning desire to upgrade my 520 ST to 
1 meg.  I understand that I need to piggyback the RAM, and am willing to wield
a soldering iron.  I have heard that I need to jumper some lines from the MMU,
but don't know which ones.  Could anyone help me on this?  Are there other
things I should be aware of?  Any comments will be greatly appreciated.

On a different but related topic:  does anyone know where I can locate 
schematics to the 520?  Or are these considered proprietary to Atari?
I figure if I am going to hack around with the board I should know what it
is.  I haven't seen anything in my local Atari shop.

Thank you in advance for any comments you might have.

	David Gray