From: raist@rmece02.upr.clu.edu (Ricardo Hernandez)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: MegaMR trouble with graphic output
Date: 23 Nov 92 06:19:45 GMT
Organization: UPR-Mayaguez--ASEL Lab

In article <1992Nov22.012816.9145@sol.cs.wmich.edu>, 22black@sol.cs.wmich.edu (Martin Black) writes:
|> I noticed when I got my mega midget racer, and had the 030 active I had some
|> output on the workbench icons screwed up.  Meaning the letters under the icon
|> had lines through it and other messyness.  I only had to move the icons to get
|> a redraw of them for a correction.  But I was wondering what is causing that?
|> I don't notice in most all other apps except aibb 5.0, no way to have a redraw
|> on it though, so there is messy lettering in it on every line.  I don't have
|> any 32bit memory just 16bit memory.  I got the board for the mmu and the 881.
|> Also I got a board that is overclocked, but the people at Memory World said 
|> they tested the cpu's they overclock, so I have a 20mhz 030 overclocked at
|> 25mhz.  But on sysinfo, preaty much most of the releases, states that my
|> cpu is clocked at 24.20mhz, that is sysinfo tested to find out the speed.
|> 
|> And when I use the 68000 on the mmr board, there is absolutely no problem.
|> So could anyone tell me if it is the overclocking, 16bit ram, or something else?
|> I don't know if is the cause of any other problems, but I do wonder.  I have
|> had situations where I couldn't find a reason why something went bad.  Like
|> running a vistapro for about 48 hours and having a problem when I get back
|> onto the computer it might lock up.  But then there are other times I could
|> have it running several weeks without a hitch.  If it is overclocking the
|> problem I will just get a 20mhz clock put into it.  Since I am thinking of
|> doing that just to find out if that is the problem, but If anyone else
|> has had this prob or knows about it, would help.  Oh by the way I was running
|> enforcer some of the times when the system went down, and there were no hits.
|> 
|> Martin

  As you might see by reading my signature, I got a MMR too.  Well, your troubles
sound a lot like the ones I had and were one of the following things:

  * Bad connection between the MMR and the 68000 socket on the A500 motherboard.
    (just press the board to make a tighter fit... don't press too hard or 
     the board might break)

  * The overclocking... I strongly suggest you to test with a different oscillator

  * THE ONE MOST LIKELY (and the one that explains why sometimes your machine 
  crashed and why sometimes it didn't): 

       OVERHEATING OF THE AGNUS (SUPER-AGNUS).  I went through quite an adventure
  to find out this problem.  This happens that since the A500 is not designed 
  to have a MMR inside it, it can overheat the Agnus making the machine crash.
  This happened to me usually when I had to use the Math coprocessor and I had
  no 32-bit memory on where to run the program.

        My solution:  put a fan that cools the computer (or air conditioner, whatever).
  The is a project on the November issue of Amazing computing on how to put a 
  fan to your A500.  I am assumming of course, that you have an A500.

  * Use of the ARP library.  Solution: DON'T use it!  Use C='s original libraries!

     This made in my machine, also those random graphic lines.  When I say "don't
use the Arp library" I don't mean the "arp.library" file, but the "Arp C: replacements", 
and the ARp-shell.

     Final words:  If you got any trouble, talk to Memory World.  To me, they 
provided excellent service.  If you talk to CSA, unless you talk to Steve Ryker
you will most likely will hear a lot of crap.  Also, if you have an Supra hardisk/ram
adapter, I have heard that it might have some problems....

--------------------------------------------------------------
  Raist   // Amiga 500, 38Mhz Special MegaMidget Racer
        \X/  Avid user of AmigaVision, sending mail from Mayaguez, Puerto Rico 
---------
           "If the PC or Mac continues to be the standard,
            the SkyNet will never be built." - OUCH! were not my words!