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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] Sync byte on Falcon
- From: Anders Eriksson <evldhs@xxxxxxxxxxxxxx>
- Date: Wed, 06 Sep 2023 09:06:46 +0000
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On Wednesday, September 6th, 2023 at 09:36, Nicolas Pomarède <npomarede@xxxxxxxxxxxx> wrote:
> Le 06/09/2023 à 02:31, Roger Burrows a écrit :
>
> > I always thought that bit 1 of the sync byte (0xff820a) on the Falcon had the
> > same meaning as on the ST etc: a 1 bit means PAL (50Hz sync), a zero bit means
> > NTSC (60Hz sync). But Hatari 2.3.0 disagrees: it always sets the 1 bit unless
> > a monochrome monitor (71Hz sync) is connected.
> >
> > If that's really the way the hardware works, I'm extremely puzzled that Atari
> > defined a PAL/NTSC bit in the video modes settable for RGB/TV, and that TOS4
> > writes 0x02 to the sync byte (indicating 50Hz sync) for an RGB screen when the
> > PAL/NTSC bit in the mode set to 1; and 0x00 to the sync byte (indicating 60Hz
> > sync) for an RGB screen with the PAL/NTSC bit in the mode set to 0.
> >
> > This seems like a bug to me. If so, is it fixed in a later release?
>
>
> Hi
>
> doesn't the falcon use some VGA timings for all its video mode ? Which
> means 60 Hz and the bit in ff820a would be just ignored at HW level ?
The Falcon VGA mode is running at 50 Hz in Hatari (quite annoying) :)
It should be 59.94 if I remember correct.
--
Anders Eriksson
ae@xxxxxx