Re: [hatari-devel] video freq set to 60 Hz instead of 50 Hz for Falcon VGA

[Daniel Hedberg <daniel.hedberg@xxxxxxxxx>]

Actually, a lot of Falcon demos sets a 50Hz vertical refresh rate on VGA monitors by directly writing to the Videl hardware registers, while a few uses the standard 60Hz VGA video mode. I'm afraid that forcing 60Hz on VGA will break more demos than it will fix, as 50Hz on VGA is pretty common. A better solution would of course be to emulate/respect the Videl registers.

--Daniel

On Sun, Feb 25, 2024 at 5:18 PM Laurent Sallafranque <laurent.sallafranque@xxxxxxx> wrote:

Ok, I'll have a look. Which test was it ? (just to compare with previous
hatari versions) ?


Le 25/02/2024 à 15:38, Nicolas Pomarède a écrit :
> Hi
>
> I noticed that so far video vertical freq was set to 50 Hz when using
> Falcon with a VGA monitor, which doesn't seem to be correct.
>
> VGA mode can give many vertical freq (by tweaking the correct HW
> registers) but for the default GEM desktop it should be 60 Hz
>
> 50 Hz is used for RGB and TV types.
>
> Eero or Laurent, as I think you're more familiar with Falcon than me,
> can you check if this breaks something with demos known to work in
> Hatari and VGA mode ? (especially for the audio part, it sounds choppy
> in one of my test, but I'm not sure this test would work anyway with
> Hatari :) )
>
> Nicolas
>
>
>