Changes
CRTC
,/* DISPTMG (aka Display Enable) */
The border has higher priority than pixels but lower priority than the black colour output when HSYNC/VSYNC are active.
The DISPTMG can be forced to 0 by using R8 (DISPTMG Skew) on type CRTCs 0,/3 and /4 or by setting R6=0 on type CRTC 1. It is not possible to force the DISPTMG on type CRTC 2.
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