Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!van-bc!rsoft!mindlink!a464
From: a464@mindlink.UUCP (Bruce Dawson)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Scrolling with the copper (in a text editor)
Message-ID: <1463@mindlink.UUCP>
Date: 10 Apr 90 23:05:00 GMT
Organization: MIND LINK! - British Columbia, Canada
Lines: 14


     The blitter can scroll a non-interlaced text screen at 60 fps.  No need to
go faster.  The blitter can scroll an interlaced text screen at 30 fps.  No
need to go faster, since that's how long it takes to display the whole screen
and faster scrolling would be detrimental.

     Therefore, copper scrolling is not needed.

     It might reduce the CPU/bus usage of the editor, but not necessarily.
Remaking copper lists in an intuition friendly way does take a chunk of time,
makes dragging screens tiresomely slow, and can cause problems when the screen
with the custom copper list is visible but is partially covered.

.Bruce Dawson - no signature.