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From: saj@chinet.chi.il.us (Stephen Jacobs)
Newsgroups: comp.sys.atari.st.tech
Subject: Strange problem solved
Summary: Subtle result from gross cause
Keywords: blank second screen MMU DMA
Message-ID: <1990Sep13.134848.13057@chinet.chi.il.us>
Date: 13 Sep 90 13:48:48 GMT
Organization: Chinet - Chicago Public Access UNIX
Lines: 8

I asked for help last week when my Mega stopped showing the program listing,
button labels, etc in Mark Williams csd, and went blank when melt.acc was
invoked.  As predicted, the local service guy said 'bring it in when something
less tricky goes wrong'.  Well, that turned out to be the hardest part of the
repair.  D.E.G.A.S. wasn't working right, and he agreed that was a well behaved
program.  Turned out both MMU and DMA chips were failing.  It's absolutely
shocking that the machine worked almost normally with half its guts gone.
                                  Steve J.