6502/EightBitNet
1
0
Fork 0
mirror of https://github.com/MoleskiCoder/EightBitNet.git synced 2024-12-23 17:31:33 +00:00
Code Issues Projects Releases Wiki Activity

Add Z80 processor (untested, but complete)

Browse Source 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-02-16 21:32:34 +00:00
parent 3108a373d7
commit ea82c58777
11 changed files with 2213 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
EightBit.sln
View File

@ -11,6 +11,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EightBit.UnitTest", "EightB
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "M6502.Test", "M6502\M6502.Test\M6502.Test.csproj", "{854EDE2F-B54D-425C-8F68-EDA68BDC797E}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Z80", "Z80\Z80.csproj", "{C00648C1-BAC1-4EFB-816F-E87C091619D7}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@ -69,6 +71,18 @@ Global
{854EDE2F-B54D-425C-8F68-EDA68BDC797E}.Release|x64.Build.0 = Release|Any CPU
{854EDE2F-B54D-425C-8F68-EDA68BDC797E}.Release|x86.ActiveCfg = Release|Any CPU
{854EDE2F-B54D-425C-8F68-EDA68BDC797E}.Release|x86.Build.0 = Release|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Debug|Any CPU.Build.0 = Debug|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Debug|x64.ActiveCfg = Debug|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Debug|x64.Build.0 = Debug|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Debug|x86.ActiveCfg = Debug|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Debug|x86.Build.0 = Debug|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Release|Any CPU.ActiveCfg = Release|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Release|Any CPU.Build.0 = Release|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Release|x64.ActiveCfg = Release|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Release|x64.Build.0 = Release|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Release|x86.ActiveCfg = Release|Any CPU
{C00648C1-BAC1-4EFB-816F-E87C091619D7}.Release|x86.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE

18
EightBit/Chip.cs
View File

@ -51,5 +51,23 @@ namespace EightBit
public static int PromoteNibble(byte value) => LowByte(value << 4);
public static int DemoteNibble(byte value) => HighNibble(value);
public static int CountBits(int value)
{
int count = 0;
while (value != 0)
{
++count;
value &= value - 1;
}
return count;
}
public static int CountBits(byte value) => CountBits((int)value);
public static bool EvenParity(int value) => CountBits(value) % 2 == 0;
public static bool EvenParity(byte value) => EvenParity((int)value);
}
}

26
EightBit/IntelOpCodeDecoded.cs
View File

@ -6,23 +6,27 @@ namespace EightBit
{
public class IntelOpCodeDecoded
{
private readonly int x;
private readonly int y;
private readonly int z;
private readonly int p;
private readonly int q;
public IntelOpCodeDecoded()
{
}
public IntelOpCodeDecoded(byte opCode)
{
this.x = (opCode & 0b11000000) >> 6; // 0 - 3
this.y = (opCode & 0b00111000) >> 3; // 0 - 7
this.z = opCode & 0b00000111; // 0 - 7
this.p = (this.y & 0b110) >> 1; // 0 - 3
this.q = this.y & 1; // 0 - 1
this.X = (opCode & 0b11000000) >> 6; // 0 - 3
this.Y = (opCode & 0b00111000) >> 3; // 0 - 7
this.Z = opCode & 0b00000111; // 0 - 7
this.P = (this.Y & 0b110) >> 1; // 0 - 3
this.Q = this.Y & 1; // 0 - 1
}
public int X { get; }
public int Y { get; }
public int Z { get; }
public int P { get; }
public int Q { get; }
}
}

22
EightBit/IntelProcessor.cs
View File

@ -8,6 +8,9 @@ namespace EightBit
public abstract class IntelProcessor : LittleEndianProcessor
{
private static readonly int[] HalfCarryTableAdd = new int[8] { 0, 0, 1, 0, 1, 0, 1, 1 };
private static readonly int[] HalfCarryTableSub = new int[8] { 0, 1, 1, 1, 0, 0, 0, 1 };
private readonly IntelOpCodeDecoded[] decodedOpCodes = new IntelOpCodeDecoded[0x100];
private Register16 sp = new Register16((ushort)Mask.Mask16);
@ -86,6 +89,23 @@ namespace EightBit
this.OnLoweredHALT();
}
protected static int BuildHalfCarryIndex(byte before, byte value, int calculation)
{
return ((before & 0x88) >> 1) | ((value & 0x88) >> 2) | ((calculation & 0x88) >> 3);
}
protected static int CalculateHalfCarryAdd(byte before, byte value, int calculation)
{
var index = BuildHalfCarryIndex(before, value, calculation);
return HalfCarryTableAdd[index & (int)Mask.Mask3];
}
protected static int CalculateHalfCarrySub(byte before, byte value, int calculation)
{
var index = BuildHalfCarryIndex(before, value, calculation);
return HalfCarryTableSub[index & (int)Mask.Mask3];
}
protected virtual void OnRaisingHALT() => this.RaisingHALT?.Invoke(this, EventArgs.Empty);
protected virtual void OnRaisedHALT() => this.RaisedHALT?.Invoke(this, EventArgs.Empty);
@ -192,5 +212,7 @@ namespace EightBit
++this.PC();
this.RaiseHALT();
}
protected IntelOpCodeDecoded GetDecodedOpCode(byte opCode) => this.decodedOpCodes[opCode];
}
}

2
EightBit/Mask.cs
View File

@ -4,8 +4,6 @@
namespace EightBit
{
using System;
public enum Mask
{
None = 0,

2
EightBit/Register16.cs
View File

@ -76,7 +76,7 @@ namespace EightBit
return false;
}
Register16 rhs = (Register16)obj;
var rhs = (Register16)obj;
return rhs.Word == this.Word;
}

36
Z80/Properties/AssemblyInfo.cs Normal file
View File

@ -0,0 +1,36 @@
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("Z80")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("Z80")]
[assembly: AssemblyCopyright("Copyright © 2019")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("c00648c1-bac1-4efb-816f-e87c091619d7")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

59
Z80/RefreshRegister.cs Normal file
View File

@ -0,0 +1,59 @@
namespace EightBit
{
public struct RefreshRegister
{
private readonly byte high;
private byte variable;
public RefreshRegister(byte value)
{
this.high = (byte)(value & (byte)Bits.Bit7);
this.variable = (byte)(value & (byte)Mask.Mask7);
}
public static implicit operator byte(RefreshRegister input)
{
return ToByte(input);
}
public static implicit operator RefreshRegister(byte input)
{
return FromByte(input);
}
public static byte ToByte(RefreshRegister input)
{
return (byte)((input.high << 7) | input.variable);
}
public static RefreshRegister FromByte(byte input)
{
return new RefreshRegister(input);
}
public static RefreshRegister operator ++(RefreshRegister value) => Increment(value);
public static bool operator ==(RefreshRegister left, RefreshRegister right) => left.Equals(right);
public static bool operator !=(RefreshRegister left, RefreshRegister right) => !(left == right);
public static RefreshRegister Increment(RefreshRegister value)
{
++value.variable;
return value;
}
public override bool Equals(object obj)
{
if (!(obj is RefreshRegister))
{
return false;
}
var rhs = (RefreshRegister)obj;
return rhs.high == this.high && rhs.variable == this.variable;
}
public override int GetHashCode() => this.high + this.variable;
}
}

39
Z80/StatusBits.cs Normal file
View File

@ -0,0 +1,39 @@
// <copyright file="StatusBits.cs" company="Adrian Conlon">
// Copyright (c) Adrian Conlon. All rights reserved.
// </copyright>
namespace EightBit
{
using System;
[Flags]
public enum StatusBits
{
// Negative
SF = Bits.Bit7,
// Zero
ZF = Bits.Bit6,
// Undocumented Y flag
YF = Bits.Bit5,
// Half carry
HC = Bits.Bit4,
// Undocumented X flag
XF = Bits.Bit3,
// Parity
PF = Bits.Bit2,
// Zero
VF = Bits.Bit2,
// Negative?
NF = Bits.Bit1,
// Carry
CF = Bits.Bit0,
}
}

1951
Z80/Z80.cs Normal file
View File

File diff suppressed because it is too large Load Diff

58
Z80/Z80.csproj Normal file
View File

@ -0,0 +1,58 @@
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{C00648C1-BAC1-4EFB-816F-E87C091619D7}</ProjectGuid>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>Z80</RootNamespace>
<AssemblyName>Z80</AssemblyName>
<TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<Deterministic>true</Deterministic>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
<LangVersion>latest</LangVersion>
<CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="Microsoft.CSharp" />
<Reference Include="System.Data" />
<Reference Include="System.Net.Http" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="RefreshRegister.cs" />
<Compile Include="StatusBits.cs" />
<Compile Include="Z80.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\EightBit\EightBit.csproj">
<Project>{6ebf8857-62a3-4ef4-af21-c1844031d7e4}</Project>
<Name>EightBit</Name>
</ProjectReference>
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>