6502/EightBitNet
1
0
Fork 0
mirror of https://github.com/MoleskiCoder/EightBitNet.git synced 2025-11-24 15:17:31 +00:00
Code Issues Projects Releases Wiki Activity

Simplify bus addressing

Browse Source
This commit is contained in:
Adrian Conlon
2025-07-05 09:46:59 +01:00
parent 3bbf300e05
commit c271b28495
5 changed files with 37 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
EightBit/Bus.cs
View File

@@ -61,7 +61,8 @@ namespace EightBit
public byte Read(Register16 absolute)
{
return this.Read(absolute.Low, absolute.High);
this.Address.Assign(absolute);
return this.Read();
}
public byte Read(byte low, byte high)
@@ -92,18 +93,22 @@ namespace EightBit
public void Write(ushort absolute, byte value)
{
this.Address.Word = absolute;
this.Write(value);
this.Data = value;
this.Write();
}
public void Write(Register16 absolute, byte value)
{
this.Write(absolute.Low, absolute.High, value);
this.Address.Assign(absolute);
this.Data = value;
this.Write();
}
public void Write(byte low, byte high, byte value)
{
this.Address.Assign(low, high);
this.Write(value);
this.Data = value;
this.Write();
}
[System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1030:Use events where appropriate", Justification = "The word 'raise' is used in an electrical sense")]

2
EightBit/IntelProcessor.cs
View File

@@ -177,7 +177,7 @@ namespace EightBit
protected void Restart(byte address)
{
this.MEMPTR.Assign(address, 0);
this.MEMPTR.Assign(address);
this.Call(this.MEMPTR);
}

22
EightBit/Processor.cs
View File

@@ -202,23 +202,28 @@ namespace EightBit
protected void MemoryWrite(byte low, byte high, byte data)
{
this.Bus.Address.Assign(low, high);
this.MemoryWrite(data);
this.Bus.Data = data;
this.MemoryWrite();
}
protected void MemoryWrite(ushort address, byte data)
{
this.Bus.Address.Word = address;
this.MemoryWrite(data);
this.Bus.Data = data;
this.MemoryWrite();
}
protected void MemoryWrite(Register16 address, byte data)
{
this.MemoryWrite(address.Low, address.High, data);
this.Bus.Address.Assign(address);
this.Bus.Data = data;
this.MemoryWrite();
}
protected void MemoryWrite(Register16 address)
{
this.MemoryWrite(address.Low, address.High);
this.Bus.Address.Assign(address);
this.MemoryWrite();
}
protected void MemoryWrite(byte data)
@@ -245,7 +250,8 @@ namespace EightBit
protected byte MemoryRead(Register16 address)
{
return this.MemoryRead(address.Low, address.High);
this.Bus.Address.Assign(address);
return this.MemoryRead();
}
protected virtual byte MemoryRead()
@@ -279,7 +285,8 @@ namespace EightBit
protected Register16 GetWordPaged(Register16 address)
{
return this.GetWordPaged(address.High, address.Low);
this.Bus.Address.Assign(address);
return this.GetWordPaged();
}
protected Register16 GetWordPaged(byte page, byte offset)
@@ -292,7 +299,8 @@ namespace EightBit
protected void SetWordPaged(Register16 address, Register16 value)
{
this.SetWordPaged(address.High, address.Low, value);
this.Bus.Address.Assign(address);
this.SetWordPaged(value);
}
protected void SetWordPaged(byte page, byte offset, Register16 value)

14
EightBit/Register16.cs
View File

@@ -81,7 +81,7 @@ namespace EightBit
public bool Equals(Register16? rhs) => ReferenceEquals(this, rhs) || (rhs is not null && rhs.Low == this.Low && rhs.High == this.High);
public void Assign(byte low, byte high)
public void Assign(byte low, byte high = 0)
{
this.Low = low;
this.High = high;
@@ -93,9 +93,17 @@ namespace EightBit
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public ushort Increment() => this.Word++;
public Register16 Increment()
{
this.Word++;
return this;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public ushort Decrement() => this.Word--;
public Register16 Decrement()
{
this.Word--;
return this;
}
}
}

2
M6502/Core.cs
View File

@@ -725,7 +725,7 @@ namespace M6502
protected void AbsoluteAddress() => this.FetchWordAddress();
protected void ZeroPageAddress() => this.Bus.Address.Assign(this.FetchByte(), 0);
protected void ZeroPageAddress() => this.Bus.Address.Assign(this.FetchByte());
protected void ZeroPageIndirectAddress()
{