6502/EightBitNet
1
0
Fork 0
mirror of https://github.com/MoleskiCoder/EightBitNet.git synced 2025-04-03 23:31:31 +00:00
Code Issues Projects Releases Wiki Activity

Use MEMPTR, rather than an i8080 specific intermediate register.

Browse Source 
Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-07-14 17:36:03 +01:00
parent 6f79136706
commit d0c620e709
1 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Intel8080/Intel8080.cs
View File

@ -9,7 +9,6 @@ namespace EightBit
public class Intel8080 : IntelProcessor
{
private readonly Register16 af = new Register16();
private readonly Register16 intermediate = new Register16();
private readonly InputOutput ports;
@ -705,13 +704,13 @@ namespace EightBit
private void Add(byte value, int carry = 0)
{
this.intermediate.Word = (ushort)(this.A + value + carry);
this.MEMPTR.Word = (ushort)(this.A + value + carry);
this.F = AdjustAuxiliaryCarryAdd(this.F, this.A, value, this.intermediate.Low);
this.F = AdjustAuxiliaryCarryAdd(this.F, this.A, value, this.MEMPTR.Low);
this.A = this.intermediate.Low;
this.A = this.MEMPTR.Low;
this.F = SetBit(this.F, StatusBits.CF, this.intermediate.High & (byte)StatusBits.CF);
this.F = SetBit(this.F, StatusBits.CF, this.MEMPTR.High & (byte)StatusBits.CF);
this.F = AdjustSZP(this.F, this.A);
}
@ -719,13 +718,13 @@ namespace EightBit
private byte Subtract(byte operand, byte value, int carry = 0)
{
this.intermediate.Word = (ushort)(operand - value - carry);
this.MEMPTR.Word = (ushort)(operand - value - carry);
this.F = AdjustAuxiliaryCarrySub(this.F, operand, value, this.intermediate.Word);
this.F = AdjustAuxiliaryCarrySub(this.F, operand, value, this.MEMPTR.Word);
var result = this.intermediate.Low;
var result = this.MEMPTR.Low;
this.F = SetBit(this.F, StatusBits.CF, this.intermediate.High & (byte)StatusBits.CF);
this.F = SetBit(this.F, StatusBits.CF, this.MEMPTR.High & (byte)StatusBits.CF);
this.F = AdjustSZP(this.F, result);
return result;