Path: utzoo!attcan!uunet!lll-winken!ames!nrl-cmf!ukma!gatech!bloom-beacon!oberon!pollux.usc.edu!papa
From: papa@pollux.usc.edu (Marco Papa)
Newsgroups: comp.sys.amiga
Subject: Blitter Feature (was: Re: A-Talk III 1.0e)
Message-ID: <14731@oberon.USC.EDU>
Date: 17 Jan 89 07:07:35 GMT
References: <14652@oberon.USC.EDU> <1189@esunix.UUCP> <14719@oberon.USC.EDU> <302@lakesys.UUCP>
Sender: news@oberon.USC.EDU
Reply-To: papa@pollux.usc.edu (Marco Papa)
Organization: Felsina Software, Los Angeles, CA
Lines: 22

In article <302@lakesys.UUCP> mikes@lakesys.UUCP (Mike Shawaluk) writes:
|I believe that the "flicker" problem that Blaine is talking about isn't
|actually flicker per se, but the effect seen when certain color combinations
|are scrolled in multi-color modes.  For example, if you have yellow text on a
|black background, and that line of text is scrolled upwards, you might see a
|momentary ghost text line on the screen for a fraction of a second,
|presumably since the text is being scrolled by the blitter, which can only do
|one bit plane at a time (it can do 2 bit planes without noticable flashing,
|but for 3 or more it poops out).  Has anyone out there ever seen a terminal
|program that didn't have this problem in an 8-color mode?

That's not a "flicker" problem.  Call it a "blitter feature" if you want.
Any program (not just terminal programs, but editors and others as weell)
that scrolls more than one bitplane will exhibit thei "feature" of blitter
copying.  I guess unless the blitter operation is changed, we can't do
much about it.

-- Marco Papa 'Doc'
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