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- Path: cip-mac6.coli.uni-sb.de!user
- From: rade@coli.uni-sb.de (Ralph Debusmann)
- Newsgroups: comp.sys.amiga.programmer
- Subject: AGA-Assembly problems :(
- Date: Tue, 16 Jan 1996 14:37:21 +0100
- Organization: Computational Linguistics Dept., U Saarbruecken
- Message-ID: <rade-1601961437210001@cip-mac6.coli.uni-sb.de>
- NNTP-Posting-Host: cip-mac6.coli.uni-sb.de
- X-Newsreader: Value-Added NewsWatcher 2.0b24.0+
-
- Hi all!
-
- I need some help on various AGA-problems. I am doing direct hardware
- access (don't shoot me for that alone, please :)
-
- Here we go ...
-
- 1. I've done an effect which changes the $102-Scrollvalues for each line
- of a picture. The problem is that I can only change the scrollvalues for
- lines above $ff! When I (Cop-)wait for $ffdf and then for $1007 or
- something like this and then* try to change the scrollvalue it doesn't
- work anymore. (this is more of a general ECS problem I guess)
-
- 2. I'd like to try out the new AGA dualplayfield-mode (2 * 4 bpls) but I
- don't know how to cope
- with the palettes of both playfields. Say I have to pictures with 16 cols
- each, one is the 1st playfield, the other one the second, for me it seems
- both playfields use the same colours ($180-$19e). But I'd need both
- palettes, I want 32 (2*16) not only 16 colours... The AGA.guide states
- this could be changed in $104 but it doesn't work for me (sigh) Any help?
-
- 3. I've another question on the display modulos ($108, $10a). I know I
- have to set them to -8
- when I display an AGA-pic (FMode=3). But why? How is this calculated? What
- values do I need to display an 8-bpl-picture with FMode=0? (it should
- work, but I couldn't work it out)
-
- 4. The last problem arises when I try the "mirror-effect" with 8
- bpls/FMode=3 ... It *does* mirror the picture (vertically) but the colours
- get disturbed. Why is that? I am using -88 for both $108 and $10a (-80-8,
- my pic is 320*256)
-
- Any help greatly appreciated,
-
- Ralph Debusmann
-
-
- P.S.: Please reply to my eMail rade@coli.uni-sb.de 'cause I am not
- regularly reading this newsgroup. Thanks!
-