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- Path: informatik.tu-muenchen.de!fischerj
- From: fischerj@informatik.tu-muenchen.de (Juergen "Rally" Fischer)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: AGA-Assembly problems :(
- Date: 30 Jan 1996 19:14:51 GMT
- Organization: Technische Universitaet Muenchen, Germany
- Distribution: world
- Message-ID: <4elqnb$9dc@sunsystem5.informatik.tu-muenchen.de>
- References: <rade-1601961437210001@cip-mac6.coli.uni-sb.de>
- NNTP-Posting-Host: hphalle7c.informatik.tu-muenchen.de
- To: rade@coli.uni-sb.de (Ralph Debusmann)
- Originator: fischerj@hphalle7c.informatik.tu-muenchen.de
-
-
- In article <rade-1601961437210001@cip-mac6.coli.uni-sb.de>, rade@coli.uni-sb.de (Ralph Debusmann) writes:
- |> 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)
-
- I had similar strange behaviour and switched to change $107 at horiz pos
- of eeh.. about e1 of the _previous_ line. this makes it run through
- line $ff...
-
- |>
- |> 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?
-
- mhm are you sure you got ECSENA in $100 ? else $104 is maybe not used...
-
- |>
- |> 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)
- with fmode = 0 it should be same values like on OCS!
- on fmode = 3 I always managed to get proper display with all modulos 0.
- no -8 ... -8 sounds like having too much display dma!
-
- |>
- |> 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)
-
- colors disturbed ? it's not the mirroring, you got another bug...
-
- |>
- |> 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!
- ------------------------------------------------------------------------
- fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer) =:)
-
-