I mean this is very old feature of computers TV output or composite video, S-Video similar.
VGA output of M65 missing this, or can be forgotten - resolution 1920x1200 has correct scanlines all time, scanlines are used in CRT monitors...
If will be later used CVBS or SVHS it will be needed, but looking at resolution up to 720x576 PAL or 720x480 NTSC is sadly lores.
Miro