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update 6502 core generator legit-like

This commit is contained in:
zeromus 2011-02-27 09:49:53 +00:00
parent c5febf8e20
commit 4e85d82f14
2 changed files with 32 additions and 21 deletions
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34
BizHawk.Emulation/CPUs/MOS 6502/Execute.cs
View File

@ -17,23 +17,23 @@ namespace BizHawk.Emulation.CPUs.M6502
PendingCycles += cycles;
while (PendingCycles > 0)
{
if (NMI)
{
WriteMemory((ushort)(S-- + 0x100), (byte)(PC >> 8));
WriteMemory((ushort)(S-- + 0x100), (byte)PC);
byte oldP = P;
FlagB = false;
FlagT = true;
WriteMemory((ushort)(S-- + 0x100), P);
P = oldP;
FlagI = true;
PC = ReadWord(NMIVector);
PendingCycles -= 7;
NMI = false;
}
if (NMI)
{
WriteMemory((ushort)(S-- + 0x100), (byte)(PC >> 8));
WriteMemory((ushort)(S-- + 0x100), (byte)PC);
byte oldP = P;
FlagB = false;
FlagT = true;
WriteMemory((ushort)(S-- + 0x100), P);
P = oldP;
FlagI = true;
PC = ReadWord(NMIVector);
PendingCycles -= 7;
NMI = false;
}
if(debug) Console.WriteLine(State());
ushort this_pc = PC;
ushort this_pc = PC;
byte opcode = ReadMemory(PC++);
switch (opcode)
{
@ -748,10 +748,6 @@ FlagT = true;// this seems wrong
PendingCycles -= 4; TotalExecutedCycles += 4;
break;
case 0xAD: // LDA addr
if (this_pc == 0x800A)
{
int zzz = 9;
}
A = ReadMemory(ReadWord(PC)); PC += 2;
P = (byte)((P & 0x7D) | TableNZ[A]);
PendingCycles -= 4; TotalExecutedCycles += 4;

19
CpuCoreGenerator/MOS 6502/CoreGenerator.cs
View File

@ -329,10 +329,25 @@ namespace M6502
w.WriteLine(" while (PendingCycles > 0)");
w.WriteLine(" {");
w.WriteLine(" if (NMI)");
w.WriteLine(" {");
w.WriteLine(" WriteMemory((ushort)(S-- + 0x100), (byte)(PC >> 8));");
w.WriteLine(" WriteMemory((ushort)(S-- + 0x100), (byte)PC);");
w.WriteLine(" byte oldP = P;");
w.WriteLine(" FlagB = false;");
w.WriteLine(" FlagT = true;");
w.WriteLine(" WriteMemory((ushort)(S-- + 0x100), P);");
w.WriteLine(" P = oldP;");
w.WriteLine(" FlagI = true;");
w.WriteLine(" PC = ReadWord(NMIVector);");
w.WriteLine(" PendingCycles -= 7;");
w.WriteLine(" NMI = false;");
w.WriteLine(" }");
w.WriteLine("");
w.WriteLine("if(debug) Console.WriteLine(State());");
// TODO interrupts, halt state, shit like that
w.WriteLine(" ushort this_pc = PC;");
w.WriteLine(" byte opcode = ReadMemory(PC++);");
w.WriteLine(" switch (opcode)");
w.WriteLine(" {");