public static ushort GetAbsolute(MOS6502 CPU)
{
var nextShort = CPU.ReadNextShort();
CPU.IncrementPC(2);
return(nextShort);
}
public static ushort GetAbsoluteX(MOS6502 CPU)
{
intermediateAddress = CPU.ReadNextShort();
var nextShort = (ushort)(intermediateAddress + CPU.Registers.X);
CPU.IncrementPC(2);
return(nextShort);
}
public static ushort GetIndirect(MOS6502 CPU)
{
intermediateAddress = CPU.ReadNextShort();
// 6502 bug in indirect JMP...
if ((intermediateAddress & 0x00FF) == 0xFF)
{
byte lowByte = CPU.ReadByteAt(intermediateAddress);
byte highByte = CPU.ReadByteAt((ushort)(intermediateAddress - 0x00FF));
return((ushort)(highByte << 8 | lowByte));
}
return(CPU.ReadShortAt(intermediateAddress));
}
