Changes
CRTC
,/* Overflow during Vertical Adjustment */
During vertical adjustment, if Vertical Total Adjust (R5) is changed with a value less than the current VTAC, then:
* on CRTCs 0/1/2, VTAC overflows and continues to count up to 0 to reach new R5 value
* on CRTCs 3/4, the current line is considered the last one and vertical adjustment ends
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