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From: frank@disys.dis.incom.de (Frank Thomas)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Scrollable text windows
Message-ID: <1991Jan03.120514.28426@disys.dis.incom.de>
Date: 3 Jan 91 12:05:14 GMT
References: <677@roo.UUCP> <06qW023804Ym01@JUTS.ccc.amdahl.com> <13421@milton.u.washington.edu> <676@cbmger.UUCP>
Distribution: comp.sys.amiga.tech
Organization: Delta Information Systems
Lines: 24

In <676@cbmger.UUCP> peterk@cbmger.UUCP (Peter Kittel GERMANY) writes:

>In article <13421@milton.u.washington.edu> bryant@milton.u.washington.edu (Jonathan Woolsey) writes:
>>Why is it that no one implements smooth scrolling of text on the Amiga?
>>I can see that it might be slow, but is easy on the eyes

>Oh, don't say "no one". Ever seen that program "MuchMore" used
>on the Fish disks? Never seen a smoother scrolling before!

That is true, but did you know that he is doing that with the processor.
He is doing it that way because he has to move 2 bitplanes. But if you do
this with the blitter (scrollRaster,or yourself) he moves the bitplanes
seperately which causes this well known color-flickering while moving the
stuff. The only way to do it with blitter and 2 bitplanes is to change
to bitplane modulo that way:
line of plane 1
line of plane 2
line of plane 1
line of plane 2
..
But this is only possible for games because you can not print to a screen
like that the normal way.

Frank