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From: ali@rocky.STANFORD.EDU (Ali Ozer)
Newsgroups: comp.sys.amiga
Subject: Re: Screen Death
Message-ID: <672@rocky.STANFORD.EDU>
Date: Thu, 15-Oct-87 11:15:53 EDT
Article-I.D.: rocky.672
Posted: Thu Oct 15 11:15:53 1987
Date-Received: Sat, 17-Oct-87 18:07:44 EDT
References: <4374@zen.berkeley.edu>
Reply-To: ali@rocky.UUCP (Ali Ozer)
Organization: Stanford University Computer Science Department
Lines: 25
Keywords: technicolor, fireworks_display_mode, screens

In article <4374@zen.berkeley.edu> T.S. Alan Waterman writes:
>    [Talking about multiple screens dying]
> ...  Alright, so this is wierd, yeah, but who cares? Well, the thing is, try
>as I might, the machine would not crash from this. It was (is) infinitely
>repeatable, but it _never_ crashes the machine!  Anybody have any clues?
>   I wonder whether it's an Intuition bug that can happen even if you
>do everything `right', or if it's something peculiar (very) to Show.

Well, at least the "minimal" form of the bug (which Tom mentioned
in an earlier msg: interlaced WB + interlaced screen + non interlaced screen +
front-to-back + front-to-back => FIREWORKS) seems to be a system problem,
and can crash the machine if you play with the mouse (instead of using 
A-N/A-M). Tom and I tried it on a second Amiga (512K, as opposed to Tom's
1.75M), and sure enough, same results. We tried the same thing with various 
other programs that open custom screens, such as Viewilbm (not Show), TeX 
previewer, Fed, and same results all the time. Then I tried it on a 2.5M
machine, and once again, same results. 

So the programs aren't to blame, probably Intuition is... Seems like when
you depth arrange screens of different view-modes the copper list fails to
get assembled correctly (maybe?). (In all our tests the colors of the messed
up screen seemed right --- Usually the view modes and the bit maps were
screwed up.)

Ali Ozer, ali@rocky.stanford.edu