Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!psuvax1!psuvm!dxb132
From: DXB132@psuvm.psu.edu
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Mouse blanking
Message-ID: <91127.171511DXB132@psuvm.psu.edu>
Date: 7 May 91 21:15:11 GMT
References: <9107@crash.cts.com> <MWM.91May7113724@raven.pa.dec.com>
Organization: Penn State University
Lines: 17

In article <MWM.91May7113724@raven.pa.dec.com>, mwm@pa.dec.com (Mike (My Watch
Has Windows) Meyer) says:

>Matt, what does DMouse do to prevent the sprite dma from being turned
>off while a sprite is being displayed? I'm still trying to find a good
>solution to that.

I'm not Matt, but...
The complicated solution is to syncronize with the video beam. The
simple solution is to poke zero (which means transparent - not visible)
into the "sprite data" register for sprite 0. One line of assembly. :-)

You can also avoid this problem by using SetPrefs to blank instead of
turning off sprite DMA. Turning off sprite DMA is a pretty drastic
measure, after all.

-- Dan Babcock