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From: cmcmanis@stpeter.Eng.Sun.COM (Chuck McManis)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Speeding up scrolling in CLIs on 16 color WB 2.0 screen
Keywords: WB 2.0 CLI SHELL SCROLLING 4 BITPLANES 16 COLOR
Message-ID: <143549@sun.Eng.Sun.COM>
Date: 10 Oct 90 01:56:48 GMT
References: <1990Sep28.145705.11637@uokmax.ecn.uoknor.edu>
Sender: news@sun.Eng.Sun.COM
Distribution: comp.sys.amiga.tech, comp.sys.amiga
Organization: Sun Microsystems, Mt. View, Ca.
Lines: 21

Warning I'm committing a cardinal sin by answering this with 140 messages
left to read, if its been answered already great.

In article <1990Sep28.145705.11637@uokmax.ecn.uoknor.edu> (Donald Richard Tillery Jr) writes:
>I am using 2.0 in a 16 color mode (see my Iconize program in abcfd20 for why)
>and am only disturbed by the speed of scrolls in CLIs.  Obviously a 4 bitplane
>screen requires a 4 bitplane scroll.  

The problem is that the 4 bitplane screen is eating all of the Chip bus
bandwidth just to display it do the blits are getting locked out of the
chip bus. Answer is either do the scrolling manually in blitter nasty
mode (which only helps a little since all that does is lock out the CPU)
or use the 4 abreast screen scrolling technique which doesn't work 
in layers. 


--
--Chuck McManis						    Sun Microsystems
uucp: {anywhere}!sun!cmcmanis   BIX: <none>   Internet: cmcmanis@Eng.Sun.COM
These opinions are my own and no one elses, but you knew that didn't you.
"I tell you this parrot is bleeding deceased!"