Blitter problem

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Article #34398

#34398

From: Celray Stalk
Date: Wed, 05 Oct 1988 17:36

19 lines
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I just got a Mega-4 and am having a problem with the blitter chip.
With the blitter turned off, everything is fine.  With it on, partial
"shadows" of the window border get left behind when I drag a window
across the screen with the mouse.  These are little vertical lines of
random height running up from where the bottom of the window was as it
was being moved.  It looks as if the CPU is not synchronizing itself
properly with the blitter chip, perhaps aborting a blit in the middle.
The problem occurs with both TOS 1.2 (the Mega ROM) and the new
Developer's version of TOS 1.4. 

Has anybody seen this problem before?  Do I have a bad blitter chip, or
is the problem systemic with all Mega's?

==================================================
| Michael Fischer                                |
|    Arpanet:    <fischer-michael@cs.yale.edu>   |
|    Bitnet:     <fischer-michael@yalecs.bitnet> |
|    UUCP:       <fischer-michael@yale.UUCP>     |
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Message-ID: <39610@yale-celray.yale.UUCP>

Path: arc1-ca.pugleaf.net!utzoo!utgpu!attcan!uunet!yale!root

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!attcan!uunet!yale!root
From: root@yale.UUCP (Celray Stalk)
Newsgroups: comp.sys.atari.st
Subject: Blitter problem
Keywords: mega, blitter
Message-ID: <39610@yale-celray.yale.UUCP>
Date: 5 Oct 88 17:36:47 GMT
Reply-To: fischer-michael@CS.YALE.EDU (Michael Fischer)
Organization: Yale University Computer Science Dept, New Haven CT  06520-2158
Lines: 19