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Use the correct virtual methods: BusRead and BusWrite to control bus access for Z80 a la M6502 implementation.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-02-22 19:59:42 +00:00
parent 726c3fe4cc
commit 28b7a88f0f
2 changed files with 26 additions and 26 deletions
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4
EightBit/IntelProcessor.cs
View File

@ -118,9 +118,9 @@ namespace EightBit
this.Jump(0);
}
protected sealed override void Push(byte value) => this.Bus.Write(--this.SP.Word, value);
protected sealed override void Push(byte value) => this.BusWrite(--this.SP.Word, value);
protected sealed override byte Pop() => this.Bus.Read(this.SP.Word++);
protected sealed override byte Pop() => this.BusRead(this.SP.Word++);
protected sealed override Register16 GetWord()
{

48
Z80/Z80.cs
View File

@ -455,7 +455,7 @@ namespace EightBit
case 5:
return this.HL2().Low;
case 6:
return this.Bus.Read(this.displaced ? this.DisplacedAddress : this.HL.Word);
return this.BusRead(this.displaced ? this.DisplacedAddress : this.HL.Word);
case 7:
return this.A;
default:
@ -486,7 +486,7 @@ namespace EightBit
this.HL2().Low = value;
break;
case 6:
this.Bus.Write(this.displaced ? this.DisplacedAddress : this.HL.Word, value);
this.BusWrite(this.displaced ? this.DisplacedAddress : this.HL.Word, value);
break;
case 7:
this.A = value;
@ -519,7 +519,7 @@ namespace EightBit
this.L = value;
break;
case 6:
this.Bus.Write(this.HL, value);
this.BusWrite(this.HL, value);
break;
case 7:
this.A = value;
@ -535,7 +535,7 @@ namespace EightBit
var memoryZ = z == 6;
var indirect = (!this.displaced && memoryZ) || this.displaced;
var direct = !indirect;
var operand = !this.displaced ? this.R(z) : this.Bus.Read(this.DisplacedAddress);
var operand = !this.displaced ? this.R(z) : this.BusRead(this.DisplacedAddress);
var update = x != 1; // BIT does not update
switch (x)
{
@ -611,7 +611,7 @@ namespace EightBit
}
else
{
this.Bus.Write(operand);
this.BusWrite(operand);
this.R2(z, operand);
this.Tick(15);
}
@ -978,14 +978,14 @@ namespace EightBit
this.MEMPTR.Word = this.Bus.Address.Word = this.BC.Word;
++this.MEMPTR.Word;
this.MEMPTR.High = this.Bus.Data = this.A;
this.Bus.Write();
this.BusWrite();
this.Tick(7);
break;
case 1: // LD (DE),A
this.MEMPTR.Word = this.Bus.Address.Word = this.DE.Word;
++this.MEMPTR.Word;
this.MEMPTR.High = this.Bus.Data = this.A;
this.Bus.Write();
this.BusWrite();
this.Tick(7);
break;
case 2: // LD (nn),HL
@ -997,7 +997,7 @@ namespace EightBit
this.MEMPTR.Word = this.Bus.Address.Word = this.FetchWord().Word;
++this.MEMPTR.Word;
this.MEMPTR.High = this.Bus.Data = this.A;
this.Bus.Write();
this.BusWrite();
this.Tick(13);
break;
default:
@ -1011,13 +1011,13 @@ namespace EightBit
case 0: // LD A,(BC)
this.MEMPTR.Word = this.Bus.Address.Word = this.BC.Word;
++this.MEMPTR.Word;
this.A = this.Bus.Read();
this.A = this.BusRead();
this.Tick(7);
break;
case 1: // LD A,(DE)
this.MEMPTR.Word = this.Bus.Address.Word = this.DE.Word;
++this.MEMPTR.Word;
this.A = this.Bus.Read();
this.A = this.BusRead();
this.Tick(7);
break;
case 2: // LD HL,(nn)
@ -1028,7 +1028,7 @@ namespace EightBit
case 3: // LD A,(nn)
this.MEMPTR.Word = this.Bus.Address.Word = this.FetchWord().Word;
++this.MEMPTR.Word;
this.A = this.Bus.Read();
this.A = this.BusRead();
this.Tick(13);
break;
default:
@ -1830,18 +1830,18 @@ namespace EightBit
private void XHTL()
{
this.MEMPTR.Low = this.Bus.Read(this.SP);
this.Bus.Write(this.HL2().Low);
this.MEMPTR.Low = this.BusRead(this.SP);
this.BusWrite(this.HL2().Low);
this.HL2().Low = this.MEMPTR.Low;
++this.Bus.Address.Word;
this.MEMPTR.High = this.Bus.Read();
this.Bus.Write(this.HL2().High);
this.MEMPTR.High = this.BusRead();
this.BusWrite(this.HL2().High);
this.HL2().High = this.MEMPTR.High;
}
private void BlockCompare(Register16 source, Register16 counter)
{
var value = this.Bus.Read(source);
var value = this.BusRead(source);
var result = (byte)(this.A - value);
this.F = SetFlag(this.F, StatusBits.PF, --counter.Word);
@ -1884,8 +1884,8 @@ namespace EightBit
private void BlockLoad(Register16 source, Register16 destination, Register16 counter)
{
var value = this.Bus.Read(source);
this.Bus.Write(destination, value);
var value = this.BusRead(source);
this.BusWrite(destination, value);
var xy = this.A + value;
this.F = SetFlag(this.F, StatusBits.XF, xy & (int)Bits.Bit3);
this.F = SetFlag(this.F, StatusBits.YF, xy & (int)Bits.Bit1);
@ -1923,7 +1923,7 @@ namespace EightBit
{
this.MEMPTR.Word = this.Bus.Address.Word = source.Word;
var value = this.ReadPort();
this.Bus.Write(destination, value);
this.BusWrite(destination, value);
source.High = this.Decrement(source.High);
this.F = SetFlag(this.F, StatusBits.NF);
}
@ -1956,7 +1956,7 @@ namespace EightBit
private void BlockOut(Register16 source, Register16 destination)
{
var value = this.Bus.Read(source);
var value = this.BusRead(source);
this.Bus.Address.Word = destination.Word;
this.WritePort();
destination.High = this.Decrement(destination.High);
@ -2012,8 +2012,8 @@ namespace EightBit
{
this.MEMPTR.Word = this.Bus.Address.Word = this.HL.Word;
++this.MEMPTR.Word;
var memory = this.Bus.Read();
this.Bus.Write((byte)(PromoteNibble(this.A) | HighNibble(memory)));
var memory = this.BusRead();
this.BusWrite((byte)(PromoteNibble(this.A) | HighNibble(memory)));
this.A = (byte)(HigherNibble(this.A) | LowerNibble(memory));
this.F = AdjustSZPXY(this.F, this.A);
this.F = ClearFlag(this.F, StatusBits.NF | StatusBits.HC);
@ -2023,8 +2023,8 @@ namespace EightBit
{
this.MEMPTR.Word = this.Bus.Address.Word = this.HL.Word;
++this.MEMPTR.Word;
var memory = this.Bus.Read();
this.Bus.Write((byte)(PromoteNibble(memory) | LowNibble(this.A)));
var memory = this.BusRead();
this.BusWrite((byte)(PromoteNibble(memory) | LowNibble(this.A)));
this.A = (byte)(HigherNibble(this.A) | HighNibble(memory));
this.F = AdjustSZPXY(this.F, this.A);
this.F = ClearFlag(this.F, StatusBits.NF | StatusBits.HC);