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From: yarnall@usceast.UUCP (Ken Yarnall)
Newsgroups: comp.sys.amiga
Subject: Re: 2091 address zero problems
Summary: In the firmware??
Keywords: Nope nada zip zilch
Message-ID: <3343@usceast.UUCP>
Date: 19 Jul 90 05:09:18 GMT
References: <38936@sequent.UUCP>
Organization: Math Department, University of South Carolina (ahem; The USC)
Lines: 51

In article <38936@sequent.UUCP> cseaman@sequent.UUCP (Chris "I'm Outta Here, Man!" Seaman) writes:
+Well, here are the results of my attempt to fix the 2091 problem:
+
+First, I booted my Amiga (cold) from the unmodified backup of the A2091
+Installation Disk.  I opened the shell, and ran my program that
+checks address zero (it prints the value in decimal).  It reports
+184549384 as the value.
+
[...]
+
+I then powered down the Amiga, restarted (from the 2091 Install Disk),
+and checked address zero: 184549384.  This is the same value that has
+been reported on every boot since I installed the 2091.  To be
+absolutely sure, I repeated this process two more times, with
+absolutely no difference in the outcome.
+
+If someone can point out where I erred, I would be most grateful.
+Otherwise, I can only assume that there are different ROM revisions
+out there on the 2091, and mine is different from those who don't
+have the problem.  The only other possibility I can think of would
+be a problem running the 2091 on my 2620-equipped rev 4.4 B2000-CR
+motherboard.
+
+Any ideas?

I got my ProWrite 3.0 upgrade *after* I had updated the filesystem on my 2091
(in my 2500/30), which a thread in c.s.a.tech awhile back had indicated would
clear up the `garbage-at-location-zero' problem.  When I tried to start
ProWrite op, it promptly crashed.  I called New Horizons, told the tech. rep.
what had happened, and he said "I bet you have a 2091."

What he said is that the roms on the 2091 have some inadvertently released
debugging software, that sets location zero to a non-NULL value.  He didn't
explain to me why his program crashed because of this (which it should not
have, IMHO), but he did say that his information came from Commodore.  He was
clear in that the problem was in the rom, and not in the filesystem.

New Horizons sent me ProWrite 3.0.1 in a matter of days.  Since, I have
gotten by on a little program that clears the zero spot, that I run from my
startup-sequence.  It allows JR-Comm 1.0 to run, for instance.

My dealer hinted at a rom upgrade for the 2091 being forthcoming.  Any
news??

+Chris (Has anyone seen my) Seaman  

kenny
-- 
         Ken Yarnall                 ///   yarnall@cs.scarolina.EDU
          Math Department, USC   \\\///   yarnall@ucseast.UUCP
           Columbia, S.C. 29208   \\\/   (803)777-6686