Changes
CRTC
,/* Mid-VSYNC */
On all CRTCs, in both interlace modes, a mid-VSYNC is generated when VCC=R7 on the even field. The VSYNC pulse starts in the middle of the raster line, at HCC=R0/2.
As an exception, on CRTCs 3/4, if R7=0 then mid-VSYNC will instead occur on the odd field. Source: §19.7 "Mid-VSYNC" of the CRTC Compendium.
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