diff --git a/cpld/top.v b/cpld/top.v
index dbcc61f..72de1c2 100644
--- a/cpld/top.v
+++ b/cpld/top.v
@@ -80,11 +80,8 @@ end
 
 reg [4:0] blink_cnt;
 wire blink = blink_cnt[$bits(blink_cnt)-1];
-always @(posedge n_int or negedge rst_n) begin
-	if (!rst_n)
-		blink_cnt <= 0;
-	else
-		blink_cnt <= blink_cnt + 1'b1;
+always @(posedge n_int) begin
+	blink_cnt <= blink_cnt + 1'b1;
 end
 
 reg [2:0] border;
@@ -99,32 +96,23 @@ wire screen_show = (vc < V_AREA) && (hc >= SCREEN_DELAY) && (hc < H_AREA + SCREE
 wire screen_update = (vc < V_AREA) && (hc < H_AREA) && hc0[3:0] == 4'b1111;
 wire border_update = (hc0[3:0] == 4'b1111) || (screen_show == 0);
 
-always @(posedge clk14 or negedge rst_n) begin
-	if (!rst_n) begin
-		screen_read <= 0;
-		attr <= 0;
-		bitmap <= 0;
-		attr_next <= 0;
-		bitmap_next <= 0;
-	end
-	else begin
-		screen_read <= n_mreq == 1'b1 && n_iorq == 1'b1;
+always @(posedge clk14) begin
+	screen_read <= n_mreq == 1'b1 && n_iorq == 1'b1;
 
-		if (attr_read)
-			attr_next <= vd;
-		if (bitmap_read)
-			bitmap_next <= vd;
+	if (attr_read)
+		attr_next <= vd;
+	if (bitmap_read)
+		bitmap_next <= vd;
 
-		if (screen_update)
-			attr <= attr_next;
-		else if (border_update)
-			attr[7:3] <= {2'b00, border};
+	if (screen_update)
+		attr <= attr_next;
+	else if (border_update)
+		attr[7:3] <= {2'b00, border};
 
-		if (screen_update)
-			bitmap <= {bitmap_next[7] ^ (attr_next[7] & blink), bitmap_next[6:0]};
-		else if (hc0[0])
-			bitmap <= {bitmap[6] ^ (attr[7] & blink), bitmap[5:0], 1'b0};
-	end
+	if (screen_update)
+		bitmap <= {bitmap_next[7] ^ (attr_next[7] & blink), bitmap_next[6:0]};
+	else if (hc0[0])
+		bitmap <= {bitmap[6] ^ (attr[7] & blink), bitmap[5:0], 1'b0};
 end
 
 
@@ -155,7 +143,6 @@ always @(posedge clk14)
 	n_int <= ~(vc == 239 && hc[8:6] == 3'b101);
 
 
-
 /* CLOCK */
 assign clkcpu = hc[0];
 
diff --git a/cpld/zx_ula.qsf b/cpld/zx_ula.qsf
index 5b17dd0..a9b8f55 100644
--- a/cpld/zx_ula.qsf
+++ b/cpld/zx_ula.qsf
@@ -125,7 +125,7 @@ set_global_assignment -name MULTIPLY_BASE_CLOCK_PERIOD_BY 2 -section_id clkcpu
 set_global_assignment -name OPTIMIZE_HOLD_TIMING OFF
 set_global_assignment -name FITTER_EFFORT "STANDARD FIT"
 set_global_assignment -name AUTO_TURBO_BIT ON
-set_global_assignment -name OPTIMIZE_IOC_REGISTER_PLACEMENT_FOR_TIMING ON
+set_global_assignment -name OPTIMIZE_IOC_REGISTER_PLACEMENT_FOR_TIMING NORMAL
 set_global_assignment -name SAVE_DISK_SPACE OFF
 set_global_assignment -name FIT_ONLY_ONE_ATTEMPT OFF
 set_global_assignment -name SLOW_SLEW_RATE OFF
diff --git a/out/zx_ula.pof b/out/zx_ula.pof
index 2b72ec2..5fa347b 100644
Binary files a/out/zx_ula.pof and b/out/zx_ula.pof differ