+ // If this interrupt-vector is run, Timer1 has overflowed, and that means
+ // we have not seen any signal of significant level for quite a while.
+ // This means Sync-generation is needed...
+
+ // Make sure sync-gen is running...
+ TIMSK |= (1<<OCIE0A); // Enable compare-mach-a interrupt for Timer0
+ // Open up the switch blocking attiny-generated video: