Changes
CRTC
,/* MA buffering */
CRTC 2 is the exception: at the end of the display of the last raster line of the frame, MA' captures R12/R13 instead of MA.
CRTC 1 has a bug that occurs when R5 is updated with a non-zero value on specific HCC and VLC values, but only when R5 was previously 0. This disrupts the normal VMA update process, causing the CRTC to load R12/R13 into MA at the beginning of every scanline, regardless of the VCC value.
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