diff --git a/M6502/Disassembler.cs b/M6502/Disassembler.cs
index 4020a69..b708841 100644
--- a/M6502/Disassembler.cs
+++ b/M6502/Disassembler.cs
@@ -7,10 +7,10 @@ namespace EightBit
     using System.Globalization;
     using System.Text;
 
-    public class Disassembler(Bus bus, M6502 processor, Files.Symbols.Parser symbols)
+    public class Disassembler(Bus bus, M6502Core processor, Files.Symbols.Parser symbols)
     {
         private readonly Bus bus = bus;
-        private readonly M6502 processor = processor;
+        private readonly M6502Core processor = processor;
         private readonly Files.Symbols.Parser symbols = symbols;
         private ushort address;
 
diff --git a/M6502/M6502.HarteTest/Checker.cs b/M6502/M6502.HarteTest/Checker.cs
index 537f669..bdf8141 100644
--- a/M6502/M6502.HarteTest/Checker.cs
+++ b/M6502/M6502.HarteTest/Checker.cs
@@ -29,7 +29,7 @@
         public Checker(TestRunner runner)
         {
             this.Runner = runner;
-            this.Disassembler = new(this.Runner, this.Runner.CPU, this.Symbols);
+            this.Disassembler = new(this.Runner, (EightBit.M6502Core)this.Runner.CPU, this.Symbols);
         }
 
         public void Check(Test test)
@@ -201,6 +201,12 @@
             var y_good = this.Check("Y", final.Y, cpu.Y);
             var p_good = this.Check("P", final.P, cpu.P);
 
+            if (!p_good)
+            {
+                this.Messages.Add($"Expected flags: {EightBit.Disassembler.DumpFlags(final.P)}");
+                this.Messages.Add($"Actual flags  : {EightBit.Disassembler.DumpFlags(cpu.P)}");
+            }
+
             if (final.RAM == null)
             {
                 throw new InvalidOperationException("Expected RAM cannot be null");