From 50bff99fdd758ead34489814b8e40695e712b0dd Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Tue, 3 Jan 2012 22:45:48 +0000
Subject: First pass of single byte opcodes done.

---
 .../Z80CpuBaseOpcodes.cs                                | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

(limited to 'src/Noddybox.Emulation.EightBit.Z80/Z80CpuBaseOpcodes.cs')

diff --git a/src/Noddybox.Emulation.EightBit.Z80/Z80CpuBaseOpcodes.cs b/src/Noddybox.Emulation.EightBit.Z80/Z80CpuBaseOpcodes.cs
index 378fd05..3c37561 100644
--- a/src/Noddybox.Emulation.EightBit.Z80/Z80CpuBaseOpcodes.cs
+++ b/src/Noddybox.Emulation.EightBit.Z80/Z80CpuBaseOpcodes.cs
@@ -54,7 +54,7 @@ namespace Noddybox.Emulation.EightBit.Z80
         
         #endregion
 
-        #region Status register helpers
+        #region Status/special register helpers
         
         /// <summary>
         /// Set a flag in the status register.
@@ -74,6 +74,15 @@ namespace Noddybox.Emulation.EightBit.Z80
             F &= ~flag;
         }
 
+        /// <summary>
+        /// Add a value to the R (refresh) register.
+        /// </summary>
+        /// <param name="v">The value.</param>
+        private void AddR(byte v)
+        {
+            R = (byte)((R & 0x80) | (R + v) & 0x7f);
+        }
+
         #endregion
 
         #region Stack commands
@@ -181,7 +190,7 @@ namespace Noddybox.Emulation.EightBit.Z80
         /// Compare an 8-bit value with the accumulator.
         /// </summary>
         /// <param name="b">The vakue.</param>
-        private void CMP8(byte b)
+        private void CP(byte b)
         {
             int w = A - b;
 
@@ -825,7 +834,7 @@ namespace Noddybox.Emulation.EightBit.Z80
             Z80Flags c = F & Z80Flags.Carry;
             byte b = memory.Read(HL.reg);
 
-            CMP8(b);
+            CP(b);
             F |= c;
 
             HL.reg++;
@@ -849,7 +858,7 @@ namespace Noddybox.Emulation.EightBit.Z80
             Z80Flags c = F & Z80Flags.Carry;
             byte b = memory.Read(HL.reg);
 
-            CMP8(b);
+            CP(b);
             F |= c;
 
             HL.reg--;
-- 
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