Path: utzoo!mnetor!uunet!husc6!bloom-beacon!oberon!pollux.usc.edu!papa
From: papa@pollux.usc.edu (Marco Papa)
Newsgroups: comp.sys.amiga
Subject: Re: amiga 2000 (a) and the new stuff
Message-ID: <8688@oberon.USC.EDU>
Date: 25 Apr 88 00:16:28 GMT
References: <1064@rmi.UUCP> <2614@umd5.umd.edu>
Sender: news@oberon.USC.EDU
Reply-To: papa@pollux.usc.edu (Marco Papa)
Organization: Felsina Software, Los Angeles, CA
Lines: 31

In article <2614@umd5.umd.edu> duncanj@umd5 (James Duncan) writes:
>Could someone please explain what the difference in the A2000 and the 
>B2000 are? Please note ALL differences that you know of which would
>cause incompatibility and upgrade problems. How can you tell them 
>apart?

If you are in the US, only B2000s were sold.  If you are in Europe you could
have bought either one.  In term of upgrades these are the 3 main issues (in
my opinion) that make the B2000 "more upgradable" than the A2000:

1. second video slot that provides more RGB data bits.  The FlickerFixer
   from MicrWay will use the second video slot, so it cannot be used with
   the A2000. All boards that use the second slots cannot be used with
   the A2000.

2. 1 Meg Fat Agnus.  The A2000 does not have a Fat Agnus but a whole set
   of chips that have the same function, so the new chip for the B2000
   won't go into it.

3. Coprocessor slot. The behavior of a signals is different and the master
   /slave protocol between a 68000 and 68020 is also different, so for example
   one has to extract the 68000 when adding a 68020 accelerator to a A2000,
   while no such thing is needed with a B2000.

-- Marco


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