public override void Reset()
{
PR = 0x37;
DDR = 0x2f;
RAM = new RAMMemoryChip(0x0000, 0xffff);
Kernel = new ROMMemoryChip(0xe000, 0xffff);
Kernel.SetROM(ROM_KERNAL);
BASIC_ROM = new ROMMemoryChip(0xa000, 0xbfff);
BASIC_ROM.SetROM(ROM_BASIC);
IO_MAP = new IOMemoryChip(C64, 0xd000, 0xefff);
CHAREN_ROM = new ROMMemoryChip(0xd000, 0xdfff);
CHAREN_ROM.SetROM(ROM_CHAREN);
ROM_HI_A000 = new ROMMemoryChip(0xa000, 0xbfff);
ROM_HI_E000 = new ROMMemoryChip(0xe000, 0xffff);
ROM_LO = new ROMMemoryChip(0x8000, 0x9fff);
// ROM_HI_A000.WriteToRam = false;
ROM_HI_E000.WriteToRam = false;
// ROM_LO.WriteToRam = false;
PrepareBankCache(0x37);
}
public override byte Read(int _address, bool _internal)
{
if (_address == 0x00)
{
// DDR
return(DDR);
}
if (_address == 0x01)
{
// PR
// datasette
// bit 4: sense == 0 if any key pressed
PR &= 0xef; // clear bit 4
if (!C64.Datasette.Get_F6_SENSE())
{
PR |= 0x10;
}
return(PR);
}
MemoryChip mem = SelectBank(_address);
byte data = mem.Read(_address, _internal);
return(data);
}
public override void Write(int _address, byte _data, bool _internal)
{
if (_address == 0x00)
{
// DDR
DDR = _data;
}
if (_address == 0x01)
{
// PR
if ((_data & 0x07) != (PR & 0x07))
{
PrepareBankCache(_data);
}
PR = _data;
// datasette
// bit 3: write
C64.Datasette.Set_E5_WRITE((PR & 0x08) == 0);
// bit 5: Motor
C64.Datasette.Set_C3_MOTOR((PR & 0x20) == 0);
}
MemoryChip mem = SelectBank(_address);
if (mem.IsROM)
{
// write through?
if (!mem.WriteToRam)
{
return;
}
mem = GetRAM();
}
mem.Write(_address, _data, _internal);
}