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From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.sys.amiga
Subject: Re: Sprites
Message-ID: <4034@well.UUCP>
Date: Fri, 25-Sep-87 04:24:55 EDT
Article-I.D.: well.4034
Posted: Fri Sep 25 04:24:55 1987
Date-Received: Sat, 26-Sep-87 18:53:36 EDT
References: <1758@crash.CTS.COM> <1659@gryphon.CTS.COM>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Organization: Extremely Slothful Killer Demo Writer
Lines: 21

In article <1659@gryphon.CTS.COM> jdow@gryphon.CTS.COM (Joanne Dow) writes:
>Overscan eats into sprite time.  If you overscan enough you can even 
>eat into the mouse sprite's time and even IT becomes a verticle bar. [...]

	More egg, Joanne....			:-) :-)

	There is a hardware stop for display DMA at data fetch cycle $18.
Display DMA cannot occur before this cycle.  This cycle, oddly enough, is
*just* after the data fetch for sprite 0.  So you'll never stomp the
Intuition pointer.

	Which is what I think they had in mind.

Footnote:  A little experiment you might try is to 'run' Oing, then start up
Preferences, and slowly drag the screen to the left.  As you do so, you will
slowly stomp over the sprite DMA slots, and Oing will start to fall apart.
Sorta neat to watch.
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
Leo L. Schwab -- The Guy in The Cape	ihnp4!ptsfa -\
 \_ -_		Recumbent Bikes:	      dual ---> !{well,unicom}!ewhac
O----^o	      The Only Way To Fly.	      hplabs / (pronounced "AE-wack")
"Work FOR?  I don't work FOR anybody!  I'm just having fun."  -- The Doctor