From dbba216ec701e2cfec106f032c5272c10fb35a13 Mon Sep 17 00:00:00 2001
From: saxxonpike <saxxonpike@gmail.com>
Date: Sat, 3 Nov 2012 07:05:07 +0000
Subject: [PATCH] Commodore64 CIA - registers implemented

---
 .../Computers/Commodore64/Cia.cs              | 70 +++++++++++--------
 .../Computers/Commodore64/MemBus.cs           | 12 +++-
 .../Computers/Commodore64/VicII.cs            |  3 +-
 3 files changed, 54 insertions(+), 31 deletions(-)

diff --git a/BizHawk.Emulation/Computers/Commodore64/Cia.cs b/BizHawk.Emulation/Computers/Commodore64/Cia.cs
index 7139809590..ab2bbc3336 100644
--- a/BizHawk.Emulation/Computers/Commodore64/Cia.cs
+++ b/BizHawk.Emulation/Computers/Commodore64/Cia.cs
@@ -8,13 +8,42 @@ namespace BizHawk.Emulation.Computers.Commodore64
     public class Cia
     {
         public int cycles;
+        public bool flagPin;
+        public bool interrupt;
         public byte[] regs;
-        
-        public Cia()
+        public bool serialData;
+        public bool serialReady;
+        public int shiftRegisterCycles;
+        public bool shiftRegisterInterrupt;
+        public bool shiftRegisterInterruptEnabled;
+        public bool shiftRegisterIsOutput;
+        public bool timeOfDayAlarmInterrupt;
+        public bool timeOfDayAlarmInterruptEnabled;
+        public bool underflowTimerAInterrupt;
+        public bool underflowTimerAInterruptEnabled;
+        public bool underflowTimerBInterrupt;
+        public bool underflowTimerBInterruptEnabled;
+
+        public Func<byte> ReadPortA;
+        public Func<byte> ReadPortB;
+        public Action<byte, byte> WritePortA;
+        public Action<byte, byte> WritePortB;
+
+        public Cia(Func<byte> funcReadPortA, Func<byte> funcReadPortB, Action<byte, byte> actWritePortA, Action<byte, byte> actWritePortB)
         {
             regs = new byte[0x10];
         }
 
+        static public byte DummyReadPort()
+        {
+            return 0xFF;
+        }
+
+        static public void DummyWritePort(byte val, byte direction)
+        {
+            // do nothing
+        }
+
         public void PerformCycle()
         {
             unchecked
@@ -30,38 +59,21 @@ namespace BizHawk.Emulation.Computers.Commodore64
             switch (addr & 0x0F)
             {
                 case 0x00:
+                    result = ReadPortA();
                     break;
                 case 0x01:
-                    break;
-                case 0x02:
-                    break;
-                case 0x03:
-                    break;
-                case 0x04:
-                    break;
-                case 0x05:
-                    break;
-                case 0x06:
-                    break;
-                case 0x07:
-                    break;
-                case 0x08:
-                    break;
-                case 0x09:
-                    break;
-                case 0x0A:
-                    break;
-                case 0x0B:
-                    break;
-                case 0x0C:
+                    result = ReadPortB();
                     break;
                 case 0x0D:
-                    break;
-                case 0x0E:
-                    break;
-                case 0x0F:
+                    result = regs[addr];
+                    shiftRegisterInterrupt = false;
+                    timeOfDayAlarmInterrupt = false;
+                    underflowTimerAInterrupt = false;
+                    underflowTimerBInterrupt = false;
+                    interrupt = false;
                     break;
                 default:
+                    result = regs[addr];
                     break;
             }
 
@@ -73,8 +85,10 @@ namespace BizHawk.Emulation.Computers.Commodore64
             switch (addr & 0x0F)
             {
                 case 0x00:
+                    WritePortA(val, regs[0x02]);
                     break;
                 case 0x01:
+                    WritePortB(val, regs[0x03]);
                     break;
                 case 0x02:
                     break;
diff --git a/BizHawk.Emulation/Computers/Commodore64/MemBus.cs b/BizHawk.Emulation/Computers/Commodore64/MemBus.cs
index b8d02d6501..c3d71ee455 100644
--- a/BizHawk.Emulation/Computers/Commodore64/MemBus.cs
+++ b/BizHawk.Emulation/Computers/Commodore64/MemBus.cs
@@ -266,7 +266,7 @@ namespace BizHawk.Emulation.Computers.Commodore64
                         result = sid.Read(addr);
                         break;
                     case MemoryBusDesignation.ColorRam:
-                        result = (byte)((busData & 0xF0) | (colorRam[addr & 0x03FF]));
+                        result = ReadColorRam(addr);
                         break;
                     case MemoryBusDesignation.Cia1:
                         result = cia1.Read(addr);
@@ -301,6 +301,11 @@ namespace BizHawk.Emulation.Computers.Commodore64
             return result;
         }
 
+        public byte ReadColorRam(ushort addr)
+        {
+            return (byte)((busData & 0xF0) | (colorRam[addr & 0x03FF]));
+        }
+
         public void UpdateLayout()
         {
             bool loRom = ((cpu01 & 0x01) != 0);
@@ -390,6 +395,11 @@ namespace BizHawk.Emulation.Computers.Commodore64
             }
         }
 
+        public byte VicRead(ushort addr)
+        {
+            return Read(addr);
+        }
+
         public void WipeMemory()
         {
             for (int i = 0; i < 0x10000; i += 0x80)
diff --git a/BizHawk.Emulation/Computers/Commodore64/VicII.cs b/BizHawk.Emulation/Computers/Commodore64/VicII.cs
index 4c331e9b3f..39faf14bae 100644
--- a/BizHawk.Emulation/Computers/Commodore64/VicII.cs
+++ b/BizHawk.Emulation/Computers/Commodore64/VicII.cs
@@ -153,8 +153,7 @@ namespace BizHawk.Emulation.Computers.Commodore64
 
             if (rasterInterruptEnabled && (rasterOffsetY == rasterInterruptLine) && (rasterOffsetX == 0))
             {
-                // removed for now
-                //rasterInterrupt = true;
+                rasterInterrupt = true;
             }
 
             interrupt =