Path: utzoo!attcan!uunet!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: B2000???
Message-ID: <14441@cbmvax.commodore.com>
Date: 14 Sep 90 13:34:18 GMT
References: <1990Sep13.155624.15807@usenet.ins.cwru.edu>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 30

In article <1990Sep13.155624.15807@usenet.ins.cwru.edu> pab@po.CWRU.Edu (Pete Babic) writes:
>Pardon me for my ignorance but I saw a few postings about an Amiga B2000.
>I always thought the Amiga line was A500,A2000,A3000. Is the B2000 a 
>different version of the 2000? Someone please clarify this for me.

There are two major versions of the A2000.  The original, the A2000-a, was
a 4-layer board based on the original A1000 motherboard logic (eg, thin
Agnus and all those buffers).  This machine had 512K on the motherboard.
Not long after this machine was introduced (Europe and Canada, it was never
sold in the USA) it was replaced by the A2000-b, or "B2000" as it's sometimes
called, is a 2-layer board design which is based on the A500 motherboard logic
(eg, Fat Agnus and Gary) along with its own custom bus control chip.  This 
machine has 1 megabyte of memory on-board, and both the video and coprocessor 
slots are supersets of the original A2000-a slots.  It also has the A500-style
monochrome composite video output.  The easiest way to tell the difference,
externally, is to look at the back of the machine.  The machine revision is 
given by the formula:

	'A'+ (char)(number_of_RCA_jacks-2)

Chances are extremely good that any arbitrary A2000 is of the "B" variety.  
That's just about certain in the USA (the "A" version wouldn't pass the FCC
certification necessary to sell a computer in the USA).

>Pete Babic  -  pab@po.cwru.edu    |  I'm not totally useless -

-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
      Get that coffee outta my face, put a Margarita in its place!