From 9ae1a03d201ea52647c33f675bd9c9e7f3c4137a Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Sun, 8 Apr 2012 22:40:58 +0000
Subject: Z80 passes FUSE test implementation

---
 .../Z80CpuBaseOpcodes.cs                           | 84 ++++++++++++++--------
 .../Z80CpuDecodeByte.cs                            |  6 +-
 .../Z80CpuDecodeED.cs                              |  8 +--
 3 files changed, 63 insertions(+), 35 deletions(-)

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

diff --git a/src/Noddybox.Emulation.EightBit.Z80/Z80CpuBaseOpcodes.cs b/src/Noddybox.Emulation.EightBit.Z80/Z80CpuBaseOpcodes.cs
index eed7258..02824b9 100644
--- a/src/Noddybox.Emulation.EightBit.Z80/Z80CpuBaseOpcodes.cs
+++ b/src/Noddybox.Emulation.EightBit.Z80/Z80CpuBaseOpcodes.cs
@@ -817,17 +817,21 @@ namespace Noddybox.Emulation.EightBit.Z80
             HL.reg--;
             BC.reg--;
 
+            ClearFlag(Z80Flags.HalfCarry | Z80Flags.Neg | Z80Flags.Hidden | Z80Flags.PV);
+
             if (BC.reg != 0)
             {
-                ClearFlag(Z80Flags.HalfCarry | Z80Flags.Neg);
                 SetFlag(Z80Flags.PV);
             }
-            else
+
+            b += A;
+
+            if ((b & 2) == 2)
             {
-                ClearFlag(Z80Flags.HalfCarry | Z80Flags.Neg | Z80Flags.PV);
+                F |= Z80Flags.Hidden5;
             }
 
-            F |= H35table[A + b];
+            F |= (Z80Flags)(b & 8);
         }
 
         /// <summary>
@@ -921,30 +925,26 @@ namespace Noddybox.Emulation.EightBit.Z80
         /// </summary>
         private void INI()
         {
-            int w;
+            byte w;
             byte b = device.Read(BC.reg);
             memory.Write(HL.reg, b);
 
             BC.high--;
             HL.reg++;
 
-            F = SZtable[BC.high] | H35table[BC.high];
+            w = (byte)(BC.low + b + 1);
 
-            w = BC.low + b;
+            F = SZtable[BC.high] | H35table[BC.high] | Ptable[(w & 0x07) ^ BC.high];
 
-            if ((w & 0x80) == 0x80)
+            if ((b & 0x80) == 0x80)
             {
                 SetFlag(Z80Flags.Neg);
             }
 
-            if ((w & 0x100) == 0x100)
+            if (w < b)
             {
                 SetFlag(Z80Flags.Carry | Z80Flags.HalfCarry);
             }
-            else
-            {
-                ClearFlag(Z80Flags.Carry | Z80Flags.HalfCarry);
-            }
         }
 
         /// <summary>
@@ -952,30 +952,26 @@ namespace Noddybox.Emulation.EightBit.Z80
         /// </summary>
         private void IND()
         {
-            int w;
+            byte w;
             byte b = device.Read(BC.reg);
             memory.Write(HL.reg, b);
 
             BC.high--;
             HL.reg--;
 
-            F = SZtable[BC.high] | H35table[BC.high];
+            w = (byte)(BC.low + b - 1);
 
-            w = BC.low + b;
+            F = SZtable[BC.high] | H35table[BC.high] | Ptable[(w & 0x07) ^ BC.high];
 
-            if ((w & 0x80) == 0x80)
+            if ((b & 0x80) == 0x80)
             {
                 SetFlag(Z80Flags.Neg);
             }
 
-            if ((w & 0x100) == 0x100)
+            if (w < b)
             {
                 SetFlag(Z80Flags.Carry | Z80Flags.HalfCarry);
             }
-            else
-            {
-                ClearFlag(Z80Flags.Carry | Z80Flags.HalfCarry);
-            }
         }
 
         /// <summary>
@@ -983,12 +979,28 @@ namespace Noddybox.Emulation.EightBit.Z80
         /// </summary>
         private void OUTI()
         {
-            device.Write(BC.reg, memory.Read(HL.reg));
+            BC.high--;
+
+            byte b = memory.Read(HL.reg);
+            byte w = b;
+
+            device.Write(BC.reg, b);
 
             HL.reg++;
-            BC.high--;
 
-            F = SZtable[BC.high] | H35table[BC.high];
+            w += HL.low;
+
+            F = SZtable[BC.high] | H35table[BC.high] | Ptable[(w & 0x07) ^ BC.high];
+
+            if ((b & 0x80) == 0x80)
+            {
+                SetFlag(Z80Flags.Neg);
+            }
+
+            if (w < b)
+            {
+                SetFlag(Z80Flags.Carry | Z80Flags.HalfCarry);
+            }
         }
 
         /// <summary>
@@ -996,12 +1008,28 @@ namespace Noddybox.Emulation.EightBit.Z80
         /// </summary>
         private void OUTD()
         {
-            device.Write(BC.reg, memory.Read(HL.reg));
+            BC.high--;
+
+            byte b = memory.Read(HL.reg);
+            byte w = b;
+
+            device.Write(BC.reg, b);
 
             HL.reg--;
-            BC.high--;
 
-            F = SZtable[BC.high] | H35table[BC.high] | Z80Flags.Neg;
+            w += HL.low;
+
+            F = SZtable[BC.high] | H35table[BC.high] | Ptable[(w & 0x07) ^ BC.high];
+
+            if ((b & 0x80) == 0x80)
+            {
+                SetFlag(Z80Flags.Neg);
+            }
+
+            if (w < b)
+            {
+                SetFlag(Z80Flags.Carry | Z80Flags.HalfCarry);
+            }
         }
 
         #endregion
diff --git a/src/Noddybox.Emulation.EightBit.Z80/Z80CpuDecodeByte.cs b/src/Noddybox.Emulation.EightBit.Z80/Z80CpuDecodeByte.cs
index 63ccc15..fe38625 100644
--- a/src/Noddybox.Emulation.EightBit.Z80/Z80CpuDecodeByte.cs
+++ b/src/Noddybox.Emulation.EightBit.Z80/Z80CpuDecodeByte.cs
@@ -1110,7 +1110,7 @@ namespace Noddybox.Emulation.EightBit.Z80
                     break;
 
                 case 0xc7:  // RST 0
-                    RST(0);
+                    RST(0x00);
                     break;
 
                 case 0xc8:  // RET Z
@@ -1164,7 +1164,7 @@ namespace Noddybox.Emulation.EightBit.Z80
                     break;
 
                 case 0xcf:  // RST 8
-                    RST(8);
+                    RST(0x08);
                     break;
 
                 case 0xd0:  // RET NC
@@ -1396,7 +1396,7 @@ namespace Noddybox.Emulation.EightBit.Z80
                     break;
 
                 case 0xff:  // RST 38
-                    RST(0x18);
+                    RST(0x38);
                     break;
 
                 default:
diff --git a/src/Noddybox.Emulation.EightBit.Z80/Z80CpuDecodeED.cs b/src/Noddybox.Emulation.EightBit.Z80/Z80CpuDecodeED.cs
index 7ad170c..6efba57 100644
--- a/src/Noddybox.Emulation.EightBit.Z80/Z80CpuDecodeED.cs
+++ b/src/Noddybox.Emulation.EightBit.Z80/Z80CpuDecodeED.cs
@@ -484,7 +484,7 @@ namespace Noddybox.Emulation.EightBit.Z80
                 case 0xb2:  // INIR
                     clock.Add(16);
                     INI();
-                    if (BC.reg > 0)
+                    if (BC.high > 0)
                     {
                         clock.Add(5);
                         PC -= 2;
@@ -494,7 +494,7 @@ namespace Noddybox.Emulation.EightBit.Z80
                 case 0xb3:  // OTIR
                     clock.Add(16);
                     OUTI();
-                    if (BC.reg > 0)
+                    if (BC.high > 0)
                     {
                         clock.Add(5);
                         PC -= 2;
@@ -524,7 +524,7 @@ namespace Noddybox.Emulation.EightBit.Z80
                 case 0xba:  // INDR
                     clock.Add(16);
                     IND();
-                    if (BC.reg > 0)
+                    if (BC.high > 0)
                     {
                         clock.Add(5);
                         PC -= 2;
@@ -534,7 +534,7 @@ namespace Noddybox.Emulation.EightBit.Z80
                 case 0xbb:  // OTDR
                     clock.Add(16);
                     OUTD();
-                    if (BC.reg > 0)
+                    if (BC.high > 0)
                     {
                         clock.Add(5);
                         PC -= 2;
-- 
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