Changes
CRTC
,/* CRTC Differences */
If Number of Scan Lines (R9) is updated with a value less than the current VLC, then:
* on CRTCs 0/1/2, VLC will count to its maximum value (31) before looping
* on CRTCs 3/4, the current line is considered the last one of this CRTC character and VLC changes to 0 on the next line
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