[[File:CRTC Interlace modes.png]]
On all CRTCs, in both interlace modes, an additional line is added (the 625th line) at the end of the frame. On CRTCs 1/3/4, this line is added at the end of the even field. On CRTCs 0/2, this line is added at the end of the odd fieldframe.
==== Interlace sync mode (ISM) ====