Path: utzoo!attcan!uunet!mcsun!hp4nl!spcc386!stefan
From: stefan@spcc386.UUCP (Stefan Posthuma)
Newsgroups: comp.sys.atari.st
Subject: Fine scrollin'
Message-ID: <592@spcc386.UUCP>
Date: 28 Feb 90 10:30:20 GMT
Reply-To: stefan@spcc386.UUCP (Stefan Posthuma)
Organization: SPC Company, Heeswijk-Dinther, the Netherlands
Lines: 26


Almost a week ago (I have been out of the office some time), David Clear
posted a source that does the 'Sync Scrolling'. I just had a look at it
and I must say I am a bit sceptical about it. This Overscan stuff is VERY
sensitive and for different MMU/Shifter versions you will need different
routines. Some ST's have an upper border of 16 scanlines and others have
32 (give or take a few). I haven't tried the code yet but my bet is that
it will work on some ST's and fail on some others. (But since I haven't
tried it yet, I am not 100% sure on this)
The stuff I have first finds out how many scanlines the upper border actually
has and sets a flag that the overscan code uses.

David asks for fast games using this technique, well I can say that the
German software house Thalion that employs the guy that invented sync scrolling
and some more VERY (EXTREMELY) talented people is busy working on some very
technical games that use Sync scrolling. "Leavin' Teramis" which has been
designed by a friend of mine (Richard Karsmakers, co-conspirator of ST NEWS),
is one of them, a scrolling shoot-them-up and should be out very soon.
Thalion is also doing a 3D game ("No second prize"), which makes every other
3D game look pathetic. It is written by a guy from Switzerland and when Jez San
beheld the demo at the PCW last year, he became very silent...
-- 
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