Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!cs.utexas.edu!rutgers!cbmvax!cbmehq!cbmger!peterk
From: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Newsgroups: comp.sys.amiga.tech
Subject: Re: RAM piggy-backing ?? (ooh err!)
Message-ID: <203@cbmger.UUCP>
Date: 8 Jun 90 13:25:03 GMT
References: <2113.266ea123@cc.nu.oz>
Reply-To: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Organization: Commodore Bueromaschinen GmbH, West Germany
Lines: 13

In article <2113.266ea123@cc.nu.oz> c8748411@cc.nu.oz writes:
>	What the hell (excuse the french) is RAM chip piggy-backing.
>
Well, this is an absolutely OBSOLETE (but standard for Atari ST) method
to expand your RAM capacity to the double. On top of each existing RAM
chip you solder another one, pin for pin, only letting the Select pin
(CAS) of each free. The latter ones are connected together and must
lead to "some circuitry" that does the address selection. 
Not recommended by Commodore, absolutely not.

-- 
Best regards, Dr. Peter Kittel       E-Mail to 
Commodore Frankfurt, Germany         rutgers!cbmvax!cbmbsw!cbmger!peterk