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From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: Amiga Disk & HAM problems
Message-ID: <8705060633.AA10982@cory.Berkeley.EDU>
Date: Wed, 6-May-87 02:33:21 EDT
Article-I.D.: cory.8705060633.AA10982
Posted: Wed May  6 02:33:21 1987
Date-Received: Thu, 7-May-87 07:14:55 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
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>My Amiga tends to trash disks fairly regularly.  Enough to be very
>frustrating.  I can usually (but NOT always) trash a disk with the following
>scenario:  emacs a file, start a subcli, emacs another file within it,
>write the file - BANG - disk I/O error.

	If this is the EMACS that Mike Meyer is supporting, you should
report the version number and problem to him.  The 'track 40 blues' bug has
been traced to two AmigaDOS calls:

	Delay(0) and WaitForChar(Fh, 0)

	When given 0 delay values, they tend to crash the Amiga... 
especially whatever track the disk head is over when a WRITE to disk is
made (and since AmigaDOS usually r/w's the superblock first, it is usually
track 40 that gets smashed).  If this is another EMACS, I suggest you stop
using it.

>Now, my Amiga also has another problem.  When I display the 'brick.img'
>ray-traced DBW picture a section of a line (about 1 inch long) half way down
>the screen will flicker from what it should be to a solid line of

	The DWB ray-traced pictures are INTERLACE HAM pictures.  Thus, unless
you have a high persistance display, you get the interlace flicker.

				-Matt