private static void STA_ZP(CPU cpu, MEM memory)
{
byte data1 = memory.getMem((ushort)(cpu.PC + 0x0001));
byte data2 = memory.getMem((ushort)(cpu.PC + 0x0002));
memory.setMem(data1, data2, cpu.A);
cpu.PC += 3;
}
private static void JMP_ABS(CPU cpu, MEM memory)
{
byte data1 = memory.getMem((ushort)(cpu.PC + 0x0001));
byte data2 = memory.getMem((ushort)(cpu.PC + 0x0002));
cpu.PC = (ushort)(data1 << 8);
cpu.PC += data2;
}
private static void INC_ZP(CPU cpu, MEM memory)
{
byte data1 = memory.getMem((ushort)(cpu.PC + 0x0001));
byte data2 = memory.getMem((ushort)(cpu.PC + 0x0002));
byte x = memory.getMem(data1, data2);
x++;
memory.setMem(data1, data2, x);
cpu.Z = (x == 0x00);
cpu.N = (x & 0x80) == 0x80;
cpu.PC += 3;
}
private static void JMP_INDIRECT(CPU cpu, MEM memory)
{
byte data1 = memory.getMem((ushort)(cpu.PC + 0x0001));
byte data2 = memory.getMem((ushort)(cpu.PC + 0x0002));
ushort address = (ushort)(data1 << 8);
address += data2;
byte jumpToH = memory.getMem(address);
byte jumpToL = memory.getMem((ushort)(address + 0x0001));
cpu.PC = (ushort)(jumpToH << 8);
cpu.PC += jumpToL;
}
private static void LDA_IM(CPU cpu, MEM memory)
{
byte data1 = memory.getMem((ushort)(cpu.PC + 0x0001));
cpu.A = data1;
cpu.Z = (data1 == 0x00);
cpu.N = (data1 & 0x80) == 0x80;
cpu.PC += 0x02;
}
public static void execute(CPU cpu, MEM memory)
{
switch (memory.getMem(cpu.PC))
{
case 0x4C:
JMP.JMP_ABS(cpu, memory);
return;
case 0x6C:
JMP.JMP_INDIRECT(cpu, memory);
return;
}
}
public static void execute(CPU cpu, MEM memory)
{
switch (memory.getMem(cpu.PC))
{
case 0xE6:
case 0xEE:
INC.INC_ZP(cpu, memory);
return;
case 0xF6:
case 0xFE:
return;
}
}
public static void execute(CPU cpu, MEM memory)
{
switch (memory.getMem(cpu.PC))
{
case 0x85:
STA.STA_ZP(cpu, memory);
return;
case 0x95:
case 0x8D:
case 0x9D:
case 0x99:
case 0x81:
case 0x91:
return;
}
}
public static void execute(CPU cpu, MEM memory)
{
switch (memory.getMem(cpu.PC))
{
case 0xA9:
LDA.LDA_IM(cpu, memory);
return;
case 0xA5:
case 0xB5:
case 0xAD:
case 0xBD:
case 0xB9:
case 0xA1:
case 0xB1:
return;
}
}