[hatari-devel] BITS demo : thread from atari forum
Thomas Huth
huth at users.berlios.de
Sun Jul 10 20:17:11 CEST 2011
Am Sun, 10 Jul 2011 20:03:04 +0200 (CEST)
schrieb Anders Eriksson <ae at dhs.nu>:
> On Sun, 10 Jul 2011, Nicolas Pomarède wrote:
>
> > move.b $ffff8260,d0
> > beq low_res_ok
> >
> > instead of :
> >
> > move.b $ffff8260,d0
> > and.b #3,d0
> > beq low_res_ok
> >
> > nothing we can do about this, his method is wrong and won't work on
> > a real ST.
>
> Hi,
>
> it works on my STe. We ran it on that during the Sommarhack
> competition, no problem.
IIRC there are also programs that rely on the upper bits to be 1
instead... e.g. according to the Hatari changelog:
changeset: 1501:422d0df3257d
date: Fri Dec 26 18:45:10 2008 +0100
files: src/video.c
description: On ST/STE, set unused bits to 1 when reading $ff8260
(fix Awesome Menu 16)
So I wonder whether there is some kind of rule when these bits can be
read as 0 or as 1 ...
Thomas
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