--- a/src/main.c	Thu Mar 31 23:25:52 2016 -0700
+++ b/src/main.c	Fri Apr 01 21:34:38 2016 -0700
@@ -134,7 +134,10 @@
 	}
 	if (mask & 2) {
 		vdp_run(&system->video, context->cycles);
-		//TODO: VBlank interrupt
+		uint32_t vnext = vdp_next_interrupt(&system->video);
+		if (vnext < next) {
+			next = vnext;
+		}
 	}
 	return next;
 }
@@ -148,7 +151,9 @@
 		bits |= 1;
 	}
 	vdp_run(&system->video, context->cycles);
-	//TODO: VBlank interrupt
+	if (vdp_interrupt_pending(&system->video)) {
+		bits |= 2;
+	}
 	return bits;
 }
 
@@ -158,8 +163,9 @@
 	if (which == 0) {
 		timer_run(&system->timer, context->cycles);
 		system->timer.pending = 0;
+	} else {
+		vdp_ack_interrupt(&system->video);
 	}
-	//TODO: VBlank interrupt
 }
 
 memory_region regions[] = {