The scandoubled signal _IS_ the 720x576 mode. Its not magically twice the amount of horizontal Pixels. The number of lines is doubled, no more no less.
QuoteIn last month's update thread I did post what I believe is a modeline matching the C16 core -
Modeline "720x576x50" 28.38 720 732 798 912 576 580 586 624 -HSync -VSync
You gotta translate this into the settings for the Indivision
this is how it works:
and then, since this mode is 49,something Hz and not 50,2Hz as we need, you gotta tweak the settings accordingly, perhaps remove some lines until the vertical frequency is 50.2Hz