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From: lbl@druhi.UUCP (LocklearLB)
Newsgroups: net.micro.atari
Subject: Re: Re: JS&A ad and ST future
Message-ID: <203@druhi.UUCP>
Date: Mon, 3-Feb-86 09:36:53 EST
Article-I.D.: druhi.203
Posted: Mon Feb  3 09:36:53 1986
Date-Received: Wed, 5-Feb-86 01:09:48 EST
References: <12177599929.8.MRC@PANDA> <215@imagen.UUCP> <857@spp2.UUCP> <505@kontron.UUCP>
Organization: AT&T Information Systems Laboratories, Denver
Lines: 20

>I would like to add my experience to these rumors. Having an early 520ST
>(rev A) I was able to upgrade to 1Meg. Now the bad news: The now avai-
>lable ROM version of TOS will ignore this upgrade. It will still work if
>the additional DRAMs are in but without using them. Furthermore if you
>change the appropriate system variables to update top of memory and 'MMU"
>configuration byte the system will NOT work after a reset. One has to turn
>it off and on again. I haven't found the routines yet who make it appearently
>impossible to utilize a selfupgraded 520ST (any hints?)
>

>Stephan W. Wendl

I think the problem you are having is probably more related to the fact that
you have a Rev. A board.  I just put in the ROMs on Rev. B board and I still
have 1 MEG of memory that works just fine.  Are you sure you have the final 
ROMs and not the EPROMs that were available early?  

Barry Locklear
AT&T Information Systems Labs
Denver, CO