public void Read(ushort addr, ref ushort bus)
{
if (addr >= 0x9000)
{
// 0x9000 <= addr < 0xffff in PROM
bus |= _prom.Span[addr - 0x9000];
}
else if (addr >= 0x8000)
{
// 0x8000 <= addr <= 0x8fff in IO Range
IOReadEventArgs args = new IOReadEventArgs(bus);
IORead?.Invoke(addr, args);
bus |= args.data;
}
else
{
// addr < 0x8000 in SRAM
bus |= _sram.Span[addr];
}
}
public void RemovePortReader(ushort in_address, IORead in_reader)
{
int address = in_address & 0xff;
m_io_read[address] -= in_reader;
}
public void AddPortReader(ushort in_address, IORead in_reader)
{
int address = in_address & 0xff;
m_io_read[address] += in_reader;
}
