Path: utzoo!mnetor!uunet!mcvax!ukc!eagle!gos!rpa
From: rpa@gos.ukc.ac.uk (R.P.Almeida)
Newsgroups: comp.sys.amiga
Subject: Re: amiga 2000 (a) and the new stuff
Message-ID: <1413@gos.ukc.ac.uk>
Date: 26 Apr 88 12:15:14 GMT
References: <1064@rmi.UUCP> <2614@umd5.umd.edu> <8688@oberon.USC.EDU>
Reply-To: rpa@ukc.ac.uk (R.P.Almeida)
Organization: Computing Lab, University of Kent at Canterbury, UK.
Lines: 39

In article <8688@oberon.USC.EDU> papa@pollux.usc.edu (Marco Papa) writes:
>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?
>
>1. second video slot that provides more RGB data bits.
>2. 1 Meg Fat Agnus.
>3. Coprocessor slot. The behavior of a signals is different.
>

Also

4. The B2000 has 1Mbyte memory on the main board, whereas the A2000 has
   only 0.5Mbyte on the main board, and 0.5Mbyte in a 'half full' 1Mbyte
   board in the Coprocessor slot. This means losing 0.5Mb when you want
   to add the Commodore 68020 card.

5. The B2000 has a composite video output whereas the A2000 doesnt.
   This is probably the easiest way to tell the machines apart, as the
   B2000 has an extra phono jack next to the Audio outputs. (Making a total
   of 3 phono jacks.)

6. CSA 68020 cards don't tend to work in B2000 if you have the Commodore
   A2090 hard disk controller, whereas they do in the A2000 when you change
   one of the PALS on the A2000 main board.

7. The top 0.5Mbytes of memory in the B2000 is half-fast memory, (so as to
   be compatible with the new graphics chips), whereas on the A2000 the
   extra 0.5Mb is true fast memory.


	Richard Almeida.

________________________________________________________________________
These are my personal views/findings and dont represent the views of
the University of Kent in any way.
_________________________________________________________________________