diff --git a/cores/c64/rtl/mos6526.v b/cores/c64/rtl/mos6526.v
index 0131d4f..723ecbc 100644
--- a/cores/c64/rtl/mos6526.v
+++ b/cores/c64/rtl/mos6526.v
@@ -121,10 +121,7 @@ always @(posedge clk) begin
     case (rs)
       4'h0: pra  <= db_in;
       4'h2: ddra <= db_in;
-		default: begin
-        pra  <= pra;
-        ddra <= ddra;
-		end
+      default: ;
     endcase
   if (phi2_p) pa_out <= pra | ~ddra;
 end
@@ -139,10 +136,7 @@ always @(posedge clk) begin
     case (rs)
       4'h1: prb  <= db_in;
       4'h3: ddrb <= db_in;
-      default: begin
-        prb  <= prb;
-        ddrb <= ddrb;
-      end
+      default: ;
     endcase
   if (phi2_p) begin
     pb_out[7]   <= crb[1] ? (crb[2] ? timerBff ^ timerBoverflow : timerBoverflow) : prb[7] | ~ddrb[7];
@@ -326,7 +320,7 @@ always @(posedge clk) begin
     case (rs)
       4'h8: tod_latched <= 1'b0;
       4'hb: tod_latched <= 1'b1;
-      default: tod_latched <= tod_latched;
+      default: ;
     endcase
   else if (wr)
     case (rs)
@@ -345,14 +339,7 @@ always @(posedge clk) begin
               if (db_in[4:0] == 5'h12) tod_hr <= {~db_in[7], db_in[4:0]};
               else tod_hr <= {db_in[7], db_in[4:0]};
             end
-      default: begin
-        tod_run   <= tod_run;
-        tod_10ths <= tod_10ths;
-        tod_sec   <= tod_sec;
-        tod_min   <= tod_min;
-        tod_hr    <= tod_hr;
-        tod_alarm <= tod_alarm;
-      end
+      default: ;
     endcase
   tod_prev <= tod;
   tod_tick <= 1'b0;
@@ -482,11 +469,13 @@ always @(posedge clk) begin
   end
 end
 
-reg [7:0] imr_reg;
 // Interrupt Control
 always @(posedge clk) begin
+  reg [7:0] imr_reg;
+
   if (!res_n) begin
     imr       <= 5'h00;
+    imr_reg   <= 0;
     irq_n     <= 1'b1;
     int_reset <= 0;
   end