diff options
Diffstat (limited to 'Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs')
| -rw-r--r-- | Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs b/Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs deleted file mode 100644 index 5c40854..0000000 --- a/Noddybox.Emulation.EightBit.Z80/Z80Cpu.cs +++ /dev/null @@ -1,226 +0,0 @@ -//
-// Copyright (c) 2012 Ian Cowburn
-//
-using System;
-using System.Net;
-using System.Windows;
-using System.Windows.Controls;
-using System.Windows.Documents;
-using System.Windows.Ink;
-using System.Windows.Input;
-using System.Windows.Media;
-using System.Windows.Media.Animation;
-using System.Windows.Shapes;
-
-namespace Noddybox.Emulation.EightBit.Z80
-{
- /// <summary>
- /// Provides an implementation of a Zilog Z80 processor.
- /// </summary>
- public partial class Z80Cpu : ICpu
- {
- #region Private types
-
- [Flags]
- private enum Z80Flags
- {
- None = 0x00,
- Carry = 0x01,
- Neg = 0x02,
- PV = 0x04,
- Hidden3 = 0x08,
- HalfCarry = 0x10,
- Hidden5 = 0x20,
- Zero = 0x40,
- Sign = 0x80
- };
-
- #endregion
-
- #region Private data
-
- // Lookup tables
- //
- private Z80Flags[] PSZtable = new Z80Flags[512];
- private Z80Flags[] SZtable = new Z80Flags[512];
- private Z80Flags[] Ptable = new Z80Flags[512];
- private Z80Flags[] Stable = new Z80Flags[512];
- private Z80Flags[] Ztable = new Z80Flags[512];
- private Z80Flags[] H35table = new Z80Flags[256];
-
- // Machine accessors
- //
- private IMemory memory;
- private IDevice device;
- private Clock clock;
-
- // Main registers
- //
- private byte A;
- private Z80Flags F;
- private Register16 BC = new Register16(0);
- private Register16 DE = new Register16(0);
- private Register16 HL = new Register16(0);
- private Register16 IX = new Register16(0);
- private Register16 IY = new Register16(0);
- private ushort SP;
- private ushort PC;
-
- // Alternate registers
- //
- private Register16 AF_ = new Register16(0);
- private Register16 BC_ = new Register16(0);
- private Register16 DE_ = new Register16(0);
- private Register16 HL_ = new Register16(0);
-
- // Auxilliary registers and flags
- //
- private byte I;
- private byte R;
- private bool IFF1;
- private bool IFF2;
- private int IM;
- private bool HALT;
-
- #endregion
-
- #region ICpu Members
-
- public void Initialise(IMemory memory, IDevice device, Clock clock)
- {
- this.memory = memory;
- this.device = device;
- this.clock = clock;
-
- Reset();
- }
-
- public void Reset()
- {
- PC = 0;
- A = 0xff;
- F = (Z80Flags)0xff;
-
- BC.reg = 0xffff;
- DE.reg = 0xffff;
- HL.reg = 0xffff;
- AF_.reg = 0xffff;
- BC_.reg = 0xffff;
- DE_.reg = 0xffff;
- HL_.reg = 0xffff;
-
- IX.reg = 0xffff;
- IY.reg = 0xffff;
-
- SP = 0xffff;
-
- IFF1 = false;
- IFF2 = false;
- IM = 0;
- I = 0;
- R = 0;
- HALT = false;
- }
-
- public void Step()
- {
- // TODO: Single step.
- }
-
- public void Run()
- {
- while(!clock.FrameDone)
- {
- Step();
- }
- }
-
- public void MaskableInterrupt(byte value)
- {
- clock.Add(2);
-
- // TODO: INT
- }
-
- public void NonMaskableInterrupt(byte value)
- {
- clock.Add(2);
-
- // TODO: NMI
- }
-
- #endregion
-
- #region Constructors
-
- public Z80Cpu()
- {
- // Verify runtime
- //
- Register16.Verify();
-
- // Setup lookup tables
- //
- for(int f = 0; f < 256; f++)
- {
- Z80Flags p = Z80Flags.None;
- Z80Flags z = Z80Flags.None;
- Z80Flags s = Z80Flags.None;
- Z80Flags h3 = Z80Flags.None;
- Z80Flags h5 = Z80Flags.None;
-
- int parity = 0;
-
- for(int b=0; b < 8; b++)
- {
- if ((f & (1<<b)) == (1<<b))
- {
- parity++;
- }
- }
-
- if ((parity & 1) == 1)
- {
- p = Z80Flags.PV;
- }
-
- if (f == 0)
- {
- z = Z80Flags.Zero;
- }
-
- if ((f & 0x80) == 0x80)
- {
- s = Z80Flags.Sign;
- }
-
- if ((f & (int)Z80Flags.Hidden3) == (int)Z80Flags.Hidden3)
- {
- h3 = Z80Flags.Hidden3;
- }
-
- if ((f & (int)Z80Flags.Hidden5) == (int)Z80Flags.Hidden5)
- {
- h5 = Z80Flags.Hidden5;
- }
-
- Ptable[f] = p;
- Stable[f] = s;
- Ztable[f] = z;
- SZtable[f] =z | s;
- PSZtable[f] = z | s | p;
- H35table[f] = h3 | h5;
-
- Ptable[f+256] = Ptable[f] | Z80Flags.Carry;
- Stable[f+256] = Stable[f] | Z80Flags.Carry;
- Ztable[f+256] = Ztable[f] | Z80Flags.Carry;
- SZtable[f+256] = SZtable[f] | Z80Flags.Carry;
- PSZtable[f+256] = PSZtable[f] | Z80Flags.Carry;
- }
-
- Reset();
- }
-
- #endregion
- }
-}
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