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From: drtiller@uokmax.ecn.uoknor.edu (Donald Richard Tillery Jr)
Newsgroups: comp.sys.amiga.tech
Subject: Speeding up scrolling in CLIs on 16 color WB 2.0 screen
Summary: Is it possible?
Keywords: WB 2.0 CLI SHELL SCROLLING 4 BITPLANES 16 COLOR
Message-ID: <1990Sep28.145705.11637@uokmax.ecn.uoknor.edu>
Date: 28 Sep 90 14:57:05 GMT
Distribution: comp.sys.amiga.tech, comp.sys.amiga
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK
Lines: 21

Ok, I know, I posted this on c.s.a a few weeks ago but I was ignored and I
really would like some input (possibly from the C= gods).

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.  However, since the CLIs almost never use
any other than the base 4 colors (with the palette I use the other 12 colors
wouldn't be very exciting anyway) to maintain compatibility with people in 4
color mode (that is text files with escape codes limit the colors by default),
wouldn't it be practical and (I hope for this is the reason for this post)
possible to ignore two of the bit planes on the scroll and achieve a scrolling
rate equivalent to the 2 bit plane scroll?  I don't figure C= will add that
type of feature to 2.0 themselves (well I could hope but I won't hold my
breath) but could someone give me enough information for me to put together a
hack which would do this (or maybe someone with more time and expertise could
throw such a hack together for me).  I love the 16 color (and 8 for that
matter) modes in 2.0, and they aren't really all that slow on an accelerated
machine, but those CLIs are agonizing.  Any assistance would be GREATLY
appreciated.

Rick Tillery (the displaced Razorback)