Changes
CRTC
,/* DISPTMG (aka Display Enable) */
BORDER 6:OUT &BC00,6:OUT &BD00,0
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=== Border and HSYNC ===
On all CRTCs, HBORDER is disabled when HCC=0 and enabled when HCC=R1.
The exception is for CRTC2 during an HSYNC: the HCC=0 check is skipped, so HBORDER stays on.
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