Path: utzoo!mnetor!uunet!yale!wallman-george
From: wallman-george@CS.YALE.EDU (Natuerlich!)
Newsgroups: comp.sys.atari.8bit
Subject: Re: 3D on the 8-bits (was Re: Advan Basic)
Message-ID: <26844@yale-celray.yale.UUCP>
Date: 9 Apr 88 23:43:07 GMT
References: <8804052209.AA25737@ucbvax.Berkeley.EDU> <666@nunki.usc.edu> <1552@alliant.Alliant.COM>
Sender: root@yale.UUCP
Reply-To: wallman-george@CS.YALE.EDU (Natuerlich!)
Organization: Natuerlich!'s Software Vault #5 -- Location Yale
Lines: 21
Keywords: DLI VBI

In article <1552@alliant.Alliant.COM> lackey@alliant.UUCP (Stan Lackey) writes:
>In article <666@nunki.usc.edu> rjung@castor.usc.edu (Robert Jung) writes:
>>  From a software point of view, you're probably talking about page-flipping
>>the pointers to screen RAM every 1/60th of a second, and sending a signal to
>> [DELETED]
>You don't even need to do that.  At the end of a display list, there is a
>wait-for-vertical-blank-then-jump instruction, with the jump addr normally
>being the beginning of the display list.  
>-Stan
I don't have my Atari next to me here so I can't say for sure, but wouldn't
the OS/VBI shadowing of DLISTL $D402 (?) from SDLIST $230 interfere? I believe
you have to 'turn off' shadowing before you can really use the wait-VBI-jmp
instruction. 
In any case the project from the software point of view is pretty trivial
we all agree on that.

Natuerlich!   
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