Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site ucbvax.BERKELEY.EDU
Path: utzoo!watmath!clyde!cbosgd!ihnp4!qantel!dual!lll-lcc!lll-crg!ucdavis!ucbvax!info-atari
From: ekijak@ARDC.ARPA (Edmund S. Kijak, POINT)
Newsgroups: net.micro.atari
Subject: [Dan Fleysher:  Re: Modified Display Lists]
Message-ID: <8511262208.AA28477@ucbvax.berkeley.edu>
Date: Tue, 26-Nov-85 17:03:45 EST
Article-I.D.: ucbvax.8511262208.AA28477
Posted: Tue Nov 26 17:03:45 1985
Date-Received: Fri, 29-Nov-85 08:17:08 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 30


----- Forwarded message # 1:

Received: from xerox.arpa by ARDC.ARDC.ARPA id a026363; 26 Nov 85 13:25 EST
Received: from BacoNoir.ms by ArpaGateway.ms ; 26 NOV 85 10:24:30 PST
Date: 26 Nov 85 13:24:21 EST (Tuesday)
Subject: Re: Modified Display Lists
In-reply-to: ekijak's message of Mon, 25 Nov 85 15:38:31 EST
To: Edmund S. Kijak (POINT) <ekijak@ARDC.ARPA>
From: Dan Fleysher <Fleysher.wbst@Xerox.ARPA>
Message-ID: <851126-102430-3627@Xerox>

that's strange.  Let us all know if you get an answer.  You would think
that it would be nice to jump between alternate or multiple display
lists, as one possible implementation of animation, etc.  It sounds like
the hardware responds to a JMP instruction by using the start address
pointed to by that pointer in page mumble where the start address of the
display list is stored, ignoring the one provided by the JMP
instruction.  I can't believe that is really the case...

	Dan

----- End of forwarded messages

Dan,
	Yes, animation and multiple screens (like a double exposed photograph)
are exactly what I had in mind when I found out the display list jump address
was being ignored.  Your explanation seems to be exactly what's happening.
	My thanks to others who responded (I won't repeat their messages since
copies were cc'd to the net).