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WARNING
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1987-05-25
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Article 3880 of net.micro.amiga:
Relay-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site well.UUCP
Path: well!ptsfa!lll-lcc!lll-crg!nike!oliveb!glacier!navajo!rokicki
From: rokicki@navajo.STANFORD.EDU (Tomas Rokicki)
Newsgroups: net.micro.amiga
Subject: blitter problems
Message-ID: <781@navajo.STANFORD.EDU>
Date: 8 Aug 86 00:23:02 GMT
Date-Received: 9 Aug 86 09:32:13 GMT
Organization: Stanford University
Lines: 27
[ blitter blitter blitter blitter ]
About that code I just posted. Looking in the RKM volume 2, it says
under WaitBlit():
BUGS Because of a bug in agnus, this code may return too soon when
blitter has in fact not started the blit yet, even though
BltSize has been written. This most often occurs in a heavily
loaded system with extended memory, HIRES, and 4 bitplanes.
They are exactly correct; I have found the 4 bitplanes not to be
a requirement, however. I know of no fix to my code that I posted.
So, if you run that LIFE, or use those blit routines, either do not
use extended memory or any other programs which require a lot of
blitter.
I just tried it under 1.2 beta 6; I can't seem to repeat the bug!
It repeats easily under 1.1, but I can't find any mention of the bug
fix in the docs. Perhaps the bug was a side effect of something else.
All around, I like 1.2 beta 6; all of my programs seem to work under
it. You should see the spectacular crashes Archon provides under 1.2
beta 6 with extended memory! I thought only the TRS-80 Coco did that.
It seems to work if I unplug the extended RAM though.
Does anyone know if the WaitBlit() routine has been fixed? It seems
to work for me . . .