Path: utzoo!attcan!uunet!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga
Subject: Re: Two megs of Chip RAM on an A2000 ??
Message-ID: <16329@cbmvax.commodore.com>
Date: 5 Dec 90 21:10:30 GMT
References: <1990Nov23.020807.2951@coral.bucknell.edu>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 20

In article <1990Nov23.020807.2951@coral.bucknell.edu> hollnbgh@coral.bucknell.edu writes:

>  I was under the impression that the "2-Meg" Agnus chip was 
>exactly the same as the 1-meg Agnus chip currently shipping in the
>Amiga 500's, 2x00's, AND 3000's.  

They use the same dice, but the 8372A in the A2000 has a slightly different
pinout than the 8372B used in the A3000.  Basically, the 1 Meg version hooks
up directly to 512K or 1 Meg of memory, whereas the 2 Meg version needs
external logic to deal with anything less than 2 Megs.  Since the A3000's
chip bus system is 32 bits wide, we needed external logic anyway, and had
the money to spend on the system for this extra logic.  

>Dale Hollenbaugh


-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
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