// the chip implementation calls this whenever data is written outside
// of the chip; our responsibility is to pass the written data on to any consumers
public void ymfm_interface_ymfm_external_write(ymfm.access_class type, uint32_t address, uint8_t data)
{
if (type == ymfm.access_class.ACCESS_IO && !m_io_write[address & 1].isnull())
{
m_io_write[address & 1].op_u8(data);
}
}
protected override void ymfm_external_write(ymfm.access_class type, uint32_t address, uint8_t data)
{
m_device.ymfm_interface_ymfm_external_write(type, address, data);
}
protected override uint8_t ymfm_external_read(ymfm.access_class type, uint32_t address)
{
return(m_device.ymfm_interface_ymfm_external_read(type, address));
}
// the chip implementation calls this whenever data is read from outside
// of the chip; our responsibility is to provide the data requested
public uint8_t ymfm_interface_ymfm_external_read(ymfm.access_class type, uint32_t address)
{
return((type != ymfm.access_class.ACCESS_IO || m_io_read[address & 1].isnull()) ? (u8)0 : m_io_read[address & 1].op_u8());
}