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From: 6600prao@ucsbuxa.ucsb.edu (Parik Rao)
Newsgroups: comp.sys.apple2
Subject: Re: FTA Modulae
Keywords: Animation
Message-ID: <10706@hub.ucsb.edu>
Date: 20 Apr 91 06:30:31 GMT
References: <1991Apr18.040333.2738@cs.uow.edu.au> <109414@tut.cis.ohio-state.edu> <47417@ut-emx.uucp> <109615@tut.cis.ohio-state.edu>
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 Also a small note; you only want to pei up to $A0.  Beyond that,you
will have massive problems aligning the stack/DP (since each is page-based,
ie you can only go from $00-FF).  By going to $A0, you can just pop
them both up/down by 160 bytes (320 pixels) each loop.

There are some other tricks to use, like having the stack mapped from
$00->$01->$E1 [read from bank 0, write to bank 1, shadow to bank e1],
using precompiled shapes, updating only what you change on the screen,
folding the stack so that only a certain width & height is updated,
and so forth.  The registers $e0c029,e0c035,and e0c068 are your friends.

--
Apple II Forever |       6600prao@ucsbuxa.ucsb.edu      | IBMs get the job done
Parik Rao       |      Amiga - for the creative mind     |        Class of 1994
                 Macintosh - buy it or Apple will sue you.