Changes

CRTC

21 bytes added, 3 July

/* VTAC overflow */

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 will continue to count up to its maximum value (31) before looping

* on CRTCs 3/4, the current line is considered the last one of the current frame and vertical adjustment ends

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