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Add easy to use Register16 assignment methods

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This commit is contained in:
Adrian Conlon
2024-07-01 23:27:35 +01:00
parent a9020ef0f0
commit 0c8ed57b0d
9 changed files with 98 additions and 112 deletions
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Z80/Z80.Test/Board.cs
+6 -1
View File
@@ -83,7 +83,12 @@ namespace Z80.Test
private void CPU_ExecutingInstruction_CPM(object sender, System.EventArgs e)
{
switch (this.CPU.PC.Word)
if (this.CPU.PC.High != 0)
{
// We're only interested in zero page
return;
}
switch (this.CPU.PC.Low)
{
case 0x0: // CP/M warm start
if (++this.warmstartCount == 2)
Z80/Z80.cs
+46 -56
View File
@@ -538,8 +538,7 @@ namespace EightBit
break;
case 2:
this.Tick(7);
this.MEMPTR.Low = data;
this.MEMPTR.High = this.IV;
this.MEMPTR.Assign(data, this.IV);
this.Call(this.MEMPTR);
break;
default:
@@ -804,8 +803,8 @@ namespace EightBit
switch (z)
{
case 0: // Input from port with 16-bit address
this.MEMPTR.Low = this.Bus.Address.Low = this.BC.Low;
this.MEMPTR.High = this.Bus.Address.High = this.BC.High;
this.Bus.Address.Assign(this.BC);
this.MEMPTR.Assign(Bus.Address);
this.MEMPTR.Word++;
this.ReadPort();
if (y != 6)
@@ -817,19 +816,19 @@ namespace EightBit
this.F = ClearBit(this.F, StatusBits.NF | StatusBits.HC);
break;
case 1: // Output to port with 16-bit address
this.MEMPTR.Low = this.Bus.Address.Low = this.BC.Low;
this.MEMPTR.High = this.Bus.Address.High = this.BC.High;
this.Bus.Address.Assign(this.BC);
this.MEMPTR.Assign(Bus.Address);
this.MEMPTR.Word++;
this.Bus.Data = y != 6 ? this.R(y) : (byte)0;
this.WritePort();
break;
case 2: // 16-bit add/subtract with carry
this.HL2().Word = q switch
this.HL2().Assign(q switch
{
0 => this.SBC(this.HL2(), this.RP(p)), // SBC HL, rp[p]
1 => this.ADC(this.HL2(), this.RP(p)), // ADC HL, rp[p]
_ => throw new NotSupportedException("Invalid operation mode"),
};
});
break;
case 3: // Retrieve/store register pair from/to immediate address
this.FetchWordAddress();
@@ -839,7 +838,7 @@ namespace EightBit
this.SetWord(this.RP(p));
break;
case 1: // LD rp[p], (nn)
this.RP(p).Word = this.GetWord().Word;
this.RP(p).Assign(this.GetWord());
break;
default:
throw new NotSupportedException("Invalid operation mode");
@@ -924,8 +923,7 @@ namespace EightBit
if (this.LDIR())
{
--this.PC.Word;
this.MEMPTR.Low = this.PC.Low;
this.MEMPTR.High = this.PC.High;
this.MEMPTR.Assign(this.PC);
--this.PC.Word;
}
@@ -935,8 +933,7 @@ namespace EightBit
if (this.LDDR())
{
--this.PC.Word;
this.MEMPTR.Low = this.PC.Low;
this.MEMPTR.High = this.PC.High;
this.MEMPTR.Assign(this.PC);
--this.PC.Word;
}
@@ -958,8 +955,7 @@ namespace EightBit
if (this.CPIR())
{
--this.PC.Word;
this.MEMPTR.Low = this.PC.Low;
this.MEMPTR.High = this.PC.High;
this.MEMPTR.Assign(this.PC);
--this.PC.Word;
this.Tick(5);
}
@@ -970,8 +966,7 @@ namespace EightBit
if (this.CPDR())
{
--this.PC.Word;
this.MEMPTR.Low = this.PC.Low;
this.MEMPTR.High = this.PC.High;
this.MEMPTR.Assign(this.PC);
--this.PC.Word;
this.Tick(3);
}
@@ -1093,10 +1088,10 @@ namespace EightBit
switch (q)
{
case 0: // LD rp,nn
this.RP(p).Word = this.FetchWord().Word;
this.RP(p).Assign(this.FetchWord());
break;
case 1: // ADD HL,rp
this.HL2().Word = this.Add(this.HL2(), this.RP(p));
this.HL2().Assign(this.Add(this.HL2(), this.RP(p)));
break;
default:
throw new NotSupportedException("Invalid operation mode");
@@ -1110,15 +1105,15 @@ namespace EightBit
switch (p)
{
case 0: // LD (BC),A
this.MEMPTR.Low = this.Bus.Address.Low = this.BC.Low;
this.MEMPTR.High = this.Bus.Address.High = this.BC.High;
this.Bus.Address.Assign(this.BC);
this.MEMPTR.Assign(Bus.Address);
++this.MEMPTR.Word;
this.MEMPTR.High = this.Bus.Data = this.A;
this.MemoryWrite();
break;
case 1: // LD (DE),A
this.MEMPTR.Low = this.Bus.Address.Low = this.DE.Low;
this.MEMPTR.High = this.Bus.Address.High = this.DE.High;
this.Bus.Address.Assign(this.DE);
this.MEMPTR.Assign(Bus.Address);
++this.MEMPTR.Word;
this.MEMPTR.High = this.Bus.Data = this.A;
this.MemoryWrite();
@@ -1129,8 +1124,7 @@ namespace EightBit
break;
case 3: // LD (nn),A
this.FetchWordMEMPTR();
this.Bus.Address.Low = this.MEMPTR.Low;
this.Bus.Address.High = this.MEMPTR.High;
this.Bus.Address.Assign(this.MEMPTR);
++this.MEMPTR.Word;
this.MEMPTR.High = this.Bus.Data = this.A;
this.MemoryWrite();
@@ -1144,25 +1138,24 @@ namespace EightBit
switch (p)
{
case 0: // LD A,(BC)
this.MEMPTR.Low = this.Bus.Address.Low = this.BC.Low;
this.MEMPTR.High = this.Bus.Address.High = this.BC.High;
this.Bus.Address.Assign(this.BC);
this.MEMPTR.Assign(Bus.Address);
++this.MEMPTR.Word;
this.A = this.MemoryRead();
break;
case 1: // LD A,(DE)
this.MEMPTR.Low = this.Bus.Address.Low = this.DE.Low;
this.MEMPTR.High = this.Bus.Address.High = this.DE.High;
this.Bus.Address.Assign(this.DE);
this.MEMPTR.Assign(Bus.Address);
++this.MEMPTR.Word;
this.A = this.MemoryRead();
break;
case 2: // LD HL,(nn)
this.FetchWordAddress();
this.HL2().Word = this.GetWord().Word;
this.HL2().Assign(this.GetWord());
break;
case 3: // LD A,(nn)
this.FetchWordMEMPTR();
this.Bus.Address.Low = this.MEMPTR.Low;
this.Bus.Address.High = this.MEMPTR.High;
this.Bus.Address.Assign(this.MEMPTR);
++this.MEMPTR.Word;
this.A = this.MemoryRead();
break;
@@ -1402,7 +1395,7 @@ namespace EightBit
switch (q)
{
case 0: // POP rp2[p]
this.RP2(p).Word = this.PopWord().Word;
this.RP2(p).Assign(this.PopWord());
break;
case 1:
switch (p)
@@ -1417,7 +1410,7 @@ namespace EightBit
this.Jump(this.HL2());
break;
case 3: // LD SP,HL
this.SP.Word = this.HL2().Word;
this.SP.Assign(this.HL2());
break;
default:
throw new NotSupportedException("Invalid operation mode");
@@ -1598,8 +1591,7 @@ namespace EightBit
this.LowerM1();
var returned = this.MemoryRead(this.PC);
this.RaiseM1();
this.Bus.Address.Low = this.REFRESH;
this.Bus.Address.High = this.IV;
this.Bus.Address.Assign(this.REFRESH, this.IV);
this.LowerRFSH();
this.LowerMREQ();
this.RaiseMREQ();
@@ -1678,7 +1670,7 @@ namespace EightBit
private void CallConditionalFlag(int flag) => this.CallConditional(this.ConvertCondition(flag));
private ushort SBC(Register16 operand, Register16 value)
private Register16 SBC(Register16 operand, Register16 value)
{
var subtraction = operand.Word - value.Word - (this.F & (byte)StatusBits.CF);
this.Intermediate.Word = (ushort)subtraction;
@@ -1698,10 +1690,10 @@ namespace EightBit
this.MEMPTR.Word = (ushort)(operand.Word + 1);
return this.Intermediate.Word;
return this.Intermediate;
}
private ushort ADC(Register16 operand, Register16 value)
private Register16 ADC(Register16 operand, Register16 value)
{
this.Add(operand, value, this.F & (byte)StatusBits.CF); // Leaves result in intermediate anyway
this.F = ClearBit(this.F, StatusBits.ZF, this.Intermediate.Word);
@@ -1713,10 +1705,10 @@ namespace EightBit
this.F = SetBit(this.F, StatusBits.SF, afterNegative);
this.F = AdjustOverflowAdd(this.F, beforeNegative, valueNegative, afterNegative);
return this.Intermediate.Word;
return this.Intermediate;
}
private ushort Add(Register16 operand, Register16 value, int carry = 0)
private Register16 Add(Register16 operand, Register16 value, int carry = 0)
{
var addition = operand.Word + value.Word + carry;
this.Intermediate.Word = (ushort)addition;
@@ -1728,7 +1720,7 @@ namespace EightBit
this.MEMPTR.Word = (ushort)(operand.Word + 1);
return this.Intermediate.Word;
return this.Intermediate;
}
private byte Add(byte operand, byte value, int carry = 0)
@@ -2022,8 +2014,8 @@ namespace EightBit
private void BlockIn(Register16 source, Register16 destination)
{
this.MEMPTR.Low = this.Bus.Address.Low = source.Low;
this.MEMPTR.High = this.Bus.Address.High = source.High;
this.Bus.Address.Assign(source);
this.MEMPTR.Assign(Bus.Address);
this.Tick();
this.ReadPort();
this.Tick(3);
@@ -2063,11 +2055,9 @@ namespace EightBit
this.Tick();
this.MemoryRead(source);
destination.High = this.Decrement(destination.High);
this.Bus.Address.Low = destination.Low;
this.Bus.Address.High = destination.High;
this.Bus.Address.Assign(destination);
this.WritePort();
this.MEMPTR.Low = destination.Low;
this.MEMPTR.High = destination.High;
this.MEMPTR.Assign(destination);
}
private void AdjustBlockOutFlags()
@@ -2125,8 +2115,8 @@ namespace EightBit
private void RRD()
{
this.MEMPTR.Low = this.Bus.Address.Low = this.HL.Low;
this.MEMPTR.High = this.Bus.Address.High = this.HL.High;
this.Bus.Address.Assign(this.HL);
this.MEMPTR.Assign(this.Bus.Address);
++this.MEMPTR.Word;
var memory = this.MemoryRead();
this.Tick(4);
@@ -2138,8 +2128,8 @@ namespace EightBit
private void RLD()
{
this.MEMPTR.Low = this.Bus.Address.Low = this.HL.Low;
this.MEMPTR.High = this.Bus.Address.High = this.HL.High;
this.Bus.Address.Assign(this.HL);
this.MEMPTR.Assign(this.Bus.Address);
++this.MEMPTR.Word;
var memory = this.MemoryRead();
this.Tick(4);
@@ -2151,8 +2141,8 @@ namespace EightBit
private void WritePort(byte port)
{
this.MEMPTR.Low = this.Bus.Address.Low = port;
this.MEMPTR.High = this.Bus.Address.High = this.Bus.Data = this.A;
this.Bus.Address.Assign(port, this.Bus.Data = this.A);
this.MEMPTR.Assign(this.Bus.Address);
this.WritePort();
++this.MEMPTR.Low;
}
@@ -2169,8 +2159,8 @@ namespace EightBit
private byte ReadPort(byte port)
{
this.MEMPTR.Low = this.Bus.Address.Low = port;
this.MEMPTR.High = this.Bus.Address.High = this.A;
this.Bus.Address.Assign(port, this.Bus.Data = this.A);
this.MEMPTR.Assign(this.Bus.Address);
++this.MEMPTR.Low;
return this.ReadPort();
}