6502/EightBitNet
1
0
Fork 0
mirror of https://github.com/MoleskiCoder/EightBitNet.git synced 2026-01-26 12:16:36 +00:00
Code Issues Projects Releases Wiki Activity

Align with Z80 implementation

Browse Source
This commit is contained in:
Adrian Conlon
2025-08-07 09:42:52 +01:00
parent ed6c7968bd
commit 3a8e379efd
1 changed files with 37 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
Intel8080/Intel8080.cs
View File

@@ -239,21 +239,21 @@ namespace Intel8080
switch (p)
{
case 0: // LD (BC),A
this.MemoryWrite(this.BC, this.A);
this.WriteMemoryIndirect(this.BC, this.A);
this.Tick(7);
break;
case 1: // LD (DE),A
this.MemoryWrite(this.DE, this.A);
this.WriteMemoryIndirect(this.DE, this.A);
this.Tick(7);
break;
case 2: // LD (nn),HL
this.Bus.Address.Assign(this.FetchWord());
this.FetchWordAddress();
this.SetWord(this.HL);
this.Tick(16);
break;
case 3: // LD (nn),A
this.Bus.Address.Assign(this.FetchWord());
this.MemoryWrite(this.A);
this.FetchWordMEMPTR();
this.WriteMemoryIndirect(this.A);
this.Tick(13);
break;
default:
@@ -265,21 +265,21 @@ namespace Intel8080
switch (p)
{
case 0: // LD A,(BC)
this.A = this.MemoryRead(this.BC);
this.A = this.ReadMemoryIndirect(this.BC);
this.Tick(7);
break;
case 1: // LD A,(DE)
this.A = this.MemoryRead(this.DE);
this.A = this.ReadMemoryIndirect(this.DE);
this.Tick(7);
break;
case 2: // LD HL,(nn)
this.Bus.Address.Assign(this.FetchWord());
this.FetchWordAddress();
this.HL.Assign(this.GetWord());
this.Tick(16);
break;
case 3: // LD A,(nn)
this.Bus.Address.Assign(this.FetchWord());
this.A = this.MemoryRead();
this.FetchWordMEMPTR();
this.A = this.ReadMemoryIndirect();
this.Tick(13);
break;
default:
@@ -736,6 +736,33 @@ namespace Intel8080
exchange.Low = this.MEMPTR.Low;
}
private byte ReadMemoryIndirect(Register16 via)
{
this.MEMPTR.Assign(via);
return this.ReadMemoryIndirect();
}
private byte ReadMemoryIndirect()
{
this.Bus.Address.Assign(this.MEMPTR);
this.MEMPTR.Increment();
return this.MemoryRead();
}
private void WriteMemoryIndirect(Register16 via, byte data)
{
this.MEMPTR.Assign(via);
this.WriteMemoryIndirect(data);
}
private void WriteMemoryIndirect(byte data)
{
this.Bus.Address.Assign(this.MEMPTR);
this.MEMPTR.Increment();
this.MEMPTR.High = this.Bus.Data = data;
this.MemoryWrite();
}
private void WritePort(byte port)
{
this.Bus.Address.Assign(port, this.A);