| Re: [hatari-devel] video freq set to 60 Hz instead of 50 Hz for Falcon VGA |
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Hi,
According to Hatari Videl code:
https://git.tuxfamily.org/hatari/hatari.git/tree/src/falcon/videl.c?id=HEAD#n203
There's video shifter Sync Mode register for the frequency (set by TOS,
based on the current monitor type I assume).
According to Compedium, bit 0 specifies external sync (genlock?), and
bit 1 specifies 60 Hz.
- Eero
On 25.2.2024 23.07, Nicolas Pomarède wrote:
Le 25/02/2024 à 21:39, Daniel Hedberg a écrit :
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.
Hi
do you have ready to use "formula" based on HW registers to determine
which freq is used, 50 or 60 Hz (or other freq, but as it's emulated we
need to fallback to 50 Hz for example)
Nicolas