Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Memory for A3000...
Message-ID: <15313@cbmvax.commodore.com>
Date: 22 Oct 90 16:36:11 GMT
References: <1990Oct17.015046.10982@ncsuvx.ncsu.edu>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Distribution: usa
Organization: Commodore, West Chester, PA
Lines: 19

In article <1990Oct17.015046.10982@ncsuvx.ncsu.edu> harris@hobbes.catt.ncsu.edu (Michael Harris) writes:
>Well, I finally did it.  I saved up my money, picked up the phone and ordered
>2 megabyes of 80ns 1MegX4 static column zips.  .... "we were told that in order 
>for the 3000 to realize that you have installed memory, you must completely 
>fill a bank."  Now I'm stunned.  

This is in fact true.  The A3000's Fast memory is organized into four 32 bit
wide banks, which will give you 1 Meg banks with 256K x 4 parts or 4 Meg
banks with 1 Meg x 4 parts.  There is no support in the A3000 hardware to
drive any bank as 16 bit memory, nor could there be -- to support 68030 burst
mode, this memory is configured as "synchronous" memory, which can only be
32 bits wide, a 68030 requirement.  Since the devices are four bits wide,
you need 32/4 = 8 chips for any one bank.

>Michael Harris - harris@hobbes.catt.ncsu.edu     __      ___ ___
-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
	Standing on the shoulders of giants leaves me cold	-REM