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Article #44808

Bad heap w/MacsBug and SuperLaserSpool

#44808
From: math1h3
Date: Thu, 04 Jan 1990 22:18
22 lines
1671 bytes
	I just had 4 megabytes of 80 ns ram installed in my Mac II.  I then
gleefully installed all my INITS, including SuperLaserSpool 2.0, MacsBug 6.0, 
SuperClock, Vaccine (already installed), and maybe some others.  Later that
day, when I tried to print an Excel 2.2 speadsheet, the Mac spooled and then
crashed into MacsBug with a message 'bus address error.'  Today, printing from
Word 4.0, the SuperClock display changed font, or disappeared until the
printing finished.  Using the interrupt switch to go into MacsBug, I discovered
that my system heap was bad ('bad heap at 00001e00: number of free zones does
not match heap header,' or something like that).  This heap problem disappeared
after removing SuperLaserSpool, re-appeared after re-installing, remained even
after system replacement.
	I tried removing all INITS except SuperLaserSpool and MacsBug.  Same
problem. 
	Now I removed MacsBug, and the mac prints ok, with no crashes or 
strangeness (so far), but I can't check for heap problems.  Quite possibly the
fault lies with MacsBug.  Any suggestions, comments?
	Could there be an undetected harware problem with the memory?  The
About Finder window shows a full 5120 k of memory.  Is there a problem
installing 80  ns memory in one bank, and 120 or 100 ns in the other?

David Wagner
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From: math1h3@elroy.uh.edu
Newsgroups: comp.sys.mac
Subject: Bad heap w/MacsBug and SuperLaserSpool
Message-ID: <5311.25a3776e@elroy.uh.edu>
Date: 4 Jan 90 22:18:54 GMT
Organization: University of Houston
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