While HSYNC and VSYNC are active, all the CRTC counters continue to increment normally and addresses continue to be generated.
On all CRTCs, while a VSYNC is ongoing, the condition VCC=R7 is ignored. So we cannot trigger a new VSYNC during a VSYNC. Similarly, while an HSYNC is ongoing, the condition HCC=R2 is ignored. So we cannot trigger a new HSYNC during an HSYNC.
<br>