From f69afb0f5c39a6bdb732cc20c4ad3ab5ec7c2c67 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Tue, 20 Mar 2012 23:45:29 +0000
Subject: Added instruction counter to Z80

---
 src/Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src/Noddybox.Emulation.EightBit.Z80')

diff --git a/src/Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs b/src/Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs
index 74a8df1..06433dc 100644
--- a/src/Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs
+++ b/src/Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs
@@ -123,6 +123,10 @@ namespace Noddybox.Emulation.EightBit.Z80
         private bool        HALT;
         private int         shift;
 
+        // Counters
+        //
+        private uint        executedInstructions;
+
         #endregion
 
         #region Private members
@@ -228,6 +232,7 @@ namespace Noddybox.Emulation.EightBit.Z80
             CheckInterrupts();
             AddR(1);
             shift = 0;
+            executedInstructions++;
             DecodeByte(memory.Read(PC++));
         }
 
@@ -329,6 +334,25 @@ namespace Noddybox.Emulation.EightBit.Z80
 
         #region Public members
 
+        /// <summary>
+        /// Get/reset the number of executed instructions.  If the reset is not zero, and expception is thrown.
+        /// </summary>
+        public uint ExecutedInstructions
+        {
+            get {return executedInstructions;}
+            set
+            {
+                if (value == 0)
+                {
+                    executedInstructions = 0;
+                }
+                else
+                {
+                    throw new ArgumentOutOfRangeException("Can only reset opcode count to zero");
+                }
+            }
+        }
+
         /// <summary>
         /// Set/get the current state of the accumulator.
         /// </summary>
-- 
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