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From: louie@umd5.UUCP
Newsgroups: net.micro.68k
Subject: seeking advice on dynamic memory controller
Message-ID: <421@umd5.UUCP>
Date: Thu, 14-Mar-85 10:44:15 EST
Article-I.D.: umd5.421
Posted: Thu Mar 14 10:44:15 1985
Date-Received: Fri, 15-Mar-85 21:23:37 EST
Distribution: na
Organization: U of Md, CSC, College Park, Md
Lines: 17

Hello!  I've got a little project going on at home with a Motorola
68000 Educational Computer Board.  This is a single board 68K with
32K bytes of 4116 type memories, organized as 16K x 16bits.  The 68K
is running at 4MHz.

I find that I need more than 32K of memory, and have been considering
adding 128K (16 4164 devices).  I can't replace the existing 32K of
memory since it runs from 0x0000 to 0x7FFF, and there is a ROM monitor
addressed starting at 0x8000.  It doesn't seem practical to use the
existing dynamic RAM refresh logic and address multiplexors.  I was
considering a design using the Intel 8203 dynamic RAM controller.  Is
this a good idea?  Are there any alternatives that I should look into?
-- 
--
Louis A. Mamakos WA3YMH   University of Maryland, Computer Science Center
 Internet: louie@umd5.arpa
 UUCP: {seismo!umcp-cs, ihnp4!rlgvax}!cvl!umd5!louie