Changes
CRTC
,/* Interlace sync and video mode (IVM) */
In this mode, alternating lines are displayed in the even and odd field to double the resolution.
On the even framefield, the CRTC displays the lines for which VLC is even. On the odd framefield, the CRTC displays the lines for which VLC is odd.
It is necessary to reprogram the CRTC as if we were building a frame of 624 lines.
