Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!helios!bcm!dimacs.rutgers.edu!seismo!uunet!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Updating the A2000
Message-ID: <19389@cbmvax.commodore.com>
Date: 1 Mar 91 18:35:49 GMT
References: <1991Feb21.223614.8025@kcbbs> <1991Feb24.012411.5780@comspec.uucp>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 29

In article <1991Feb24.012411.5780@comspec.uucp> darrell@comspec.uucp (Darrell Grainger) writes:
>In article <1991Feb21.223614.8025@kcbbs>, James_Mitchell@kcbbs.gen.nz (James Mitchell) writes:
>> I've got an A2000, bought around 1987, no idea what revision the motherboard 
>> might be...

>> I've taken this to my dealer to get the new Agnus & Denise chips installed, 
>> but was told that the motherboard wouldn't accept them - it was too 
>> old (wrong version *8(   )

> This does not seem right to me. I have installed at least 30 of the newer, one
>meg Agnus into Amiga 2000s and have never had any problems. 

It depends on the board.  All of the A2000b boards, from the dealer demo units
(Rev 3.9) on up to current production (Rev 6-something) support the ECS chips
and the 512K ROM.  

The A2000a board, however, doesn't support the ECS chips, and may require a
jumper added for 512K ROM support (I'm not sure on this one).  The "a" board
is the four layer board designed in Germany, the "b" board is the two layer
board designed here in West Chester.  No "a" boards were shipped in the USA,
since they didn't pass FCC regulations, but they did ship in Europe, Canada,
and possibly in the Pacific.  These can easily be identified by looking at
the back of the computer -- the "a" systems have two RCA jacks, the "b"
systems have three (the extra one is the monochrome composite video output).

-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
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	"What works for me might work for you"	-Jimmy Buffett