gyurco
commented
1 year ago Expected behavior: Same stable video signal as other cores
As there are no two cores with identical sync timings, it's hard to tell which one should be the base. Also currently I don't have any 15kHz displays to test. But it's easy to do some changes here: https://github.com/mist-devel/Menu_MIST/blob/master/menu.sv#L208
Maybe vsync should be aligned to hsync, e.g. change vsync generation to:
if(vc == line_max-3 && hc == 535) VSync <= 1;
else if (vc == 0 && hc == 567) VSync <= 0;And see what happens.
egrath
Issue: When the scandoubler is disabled (scandoubler_disable=1) the MENU core hops between different video output modes continiously. It seems that some (or even more, most) TVs have no problem with this [1], the Retrotink 5X upscaler complains about this and has issues displaying the video output of the core correctly - the entire image is wobbling around like its completely sloshed.
The two modes it oscillates between are 312p and 625i - at least the Retrotink shows this as the modes. The frequency of the oscillation is around 1/5 second.
Resolutions while in the MENU core:
Other cores don't share the same behavior, they output a nice and stable video signal:
How to reproduce: Don't know for sure, but probably with some kind of device which shows the mode of the current input video signal...
Expected behavior: Same stable video signal as other cores
Additional notes: [1]: Tested with different TV's around the house, no one has a issue displaying the core using 15 Khz [2]: Can't tell if this behavior on the MENU core only occurs when the scandoubler is disabled as the Retrotink has no VGA input.