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From: reher@ucunix.san.uc.edu (Jay R. Reher)
Newsgroups: comp.sys.amiga.hardware
Subject: A500 chip ram expansion on rev6a motherboard
Keywords: CHIP RAM
Message-ID: <1991Mar8.050613.26149@ucunix.san.uc.edu>
Date: 8 Mar 91 05:06:13 GMT
References: <10380@mirsa.inria.fr> <19575@cbmvax.commodore.com>
Sender: reher@ucunix.san.uc.edu
Organization: University of Cincinnati
Lines: 17


	I was lucky enough to get a Amiga500 with an 8372a Angus as factory.
I wish to increase my CHIP ram to 1 meg.  I have read the notes on how to
change the traces from ANGUS to 68000, but upon inspection of my motherboard,
I noticed a interesting feature.  That is my 512k chip ram is 256k x 4 dram,
with spaces between the 4 chips for 4 more chips of the same type. That is
the holes and traces exist for 4 more 256k x 4 drams.

	My question is this, Can I just add the chips and associated capac-
itors, or do I have to change the ANGUS to 68000 trace from 52 to 47 still ?
Also since I got the standard intro to amiga book, my schematic is out of date,
What is the proper rate (in volts and farads) of the capacitors ? By the way
my motherboard is a rev6a.

				Many thanx in advance,
	
						Jay Reher