Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!columbia!rutgers!cbmvax!grr
From: grr@cbmvax.cbm.UUCP (George Robbins)
Newsgroups: comp.sys.amiga
Subject: Re: Amiga 2000 memory questions.
Message-ID: <1823@cbmvax.cbmvax.cbm.UUCP>
Date: Sat, 2-May-87 17:34:46 EDT
Article-I.D.: cbmvax.1823
Posted: Sat May  2 17:34:46 1987
Date-Received: Tue, 5-May-87 04:42:59 EDT
References: <2898@eagle.ukc.ac.uk>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Distribution: world
Organization: Commodore Technology, West Chester, PA
Lines: 40
Keywords: A2000

In article <2898@eagle.ukc.ac.uk> rpa@ukc.ac.uk (R.P.Almeida) writes:
>
>Ive got an Amiga 2000, and have had it for about 3 Weeks now.
>I'm in the United Kingdom, and have the German built machine not the West 
>Chester design.
>
> Anyway, on opening up my machine, i find that there is a board in the
>processor slot, this contains 0.5Mbytes of ram, and a further 0.5Mbytes
>of empty sockets. The main board only contains 0.5Mbytes ram.
>
>  Almost the first thing i did was to go buy 16 * 256k D-ram chips and plug
> them into the empty sockets, and play about with the jumpers on the board
> until the extra .5Mbytes appeared.
>
>  I found out that the ram was mapped at C00000 to CFFFFF using ROMwack and a
>terminal.
>
>Now , what i want to know is - Is this truly fast ram, or is it slow/fast ram ?

	It is truly "fast" ram.

> And what happens to my nice 1Mbyte of ram, when Commodore bring out a 68020
>board. ??

	You get to use it for a wall hanging.


	Seriously, the A2000 was originally designed as an A1000 with the
	256K memory expansion built in and room for memory expansion on the
	expansion bus.  The presense of the 1040ST made it bit silly to have
	a "high-end" machine with only 512K.  Rather than redo most of the
	main board to cram in the extra memory, the Germans elected to make
	a simple/cheap memory card to plug into the "MMU" connector.  The
	same card, with the addition of a suitable header connector is
	intended to work with the Amiga Sidecar, which is the main reason
	for it having provision for 1MB total memory.
-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)