Changes

On CRTC 2, when HSYNC is active, the condition HCC=0 does not disable HBORDER, unlike the other CRTCs.

=== Immediate border ===

DISPTMG can be immediately forced to 0 by using R8 (DISPTMG Skew) on CRTCs 0/3/4 or by setting R6=0 on CRTC 1. It is not possible to force DISPTMG on CRTC 2.

=== Border bytes ===