public short ReadWord(int address)
{
address &= 0x00FFFFFF;
int maskedAddr;
if (address < 0x400000)
{
return((short)((RomData[address] << 8) | RomData[address + 1]));
}
if (address >= 0xE00000) // Work RAM
{
maskedAddr = address & 0xFFFE;
return((short)((Ram[maskedAddr] << 8) | Ram[maskedAddr + 1]));
}
if (address >= 0xC00000 && address < 0xC00010)
{
return((short)VDP.ReadVdp(address & 0x0E));
}
if (address >= 0xA10000 && address <= 0xA1001F)
{
return((sbyte)ReadIO(address));
}
if (address == 0xA11100) // Z80 BUS status
{
return((short)(M68000HasZ80Bus && Z80Reset == false ? 0x0000 : 0x0100));
}
Console.WriteLine("UNHANDLED READW {0:X6}", address);
return(0x7DCD);
}
public sbyte ReadByte(int address)
{
address &= 0x00FFFFFF;
if (address < 0x200000)
{
return((sbyte)RomData[address]);
}
if (address < 0x400000)
{
if (SaveRamEnabled && address >= SaveRamStartOffset && address < SaveRamEndOffset)
{
if (SaveRamEveryOtherByte)
{
return((sbyte)SaveRAM[(address - SaveRamStartOffset) >> 1]);
}
else
{
return((sbyte)SaveRAM[address - SaveRamStartOffset]);
}
}
return((sbyte)RomData[address]);
}
if (address >= 0xE00000)
{
return((sbyte)Ram[address & 0xFFFF]);
}
if (address == 0xA11100) // Z80 BUS status
{
//Console.WriteLine("QUERY z80 bus status. 68000 can access? " + (M68000HasZ80Bus && Z80Reset == false));
return((sbyte)(M68000HasZ80Bus && Z80Reset == false ? 0 : 1));
}
if (address >= 0xA10000 && address <= 0xA1001F)
{
return((sbyte)ReadIO(address));
}
if ((address & 0xFF0000) == 0xA00000)
{
return((sbyte)ReadMemoryZ80((ushort)(address & 0x7FFF)));
}
if (address >= 0xC00000 && address < 0xC00010)
{
//Console.WriteLine("byte-reading the VDP. someone is probably stupid.");
ushort value = VDP.ReadVdp(address & 0x0E);
if ((address & 1) == 0) // read MSB
{
return((sbyte)(value >> 8));
}
return((sbyte)value); // read LSB
}
Console.WriteLine("UNHANDLED READB {0:X6}", address);
return(0x7D);
}
