//WRITE8_MEMBER( i8257_device::write )
public void i8257_device_write(address_space space, offs_t offset, u8 data, u8 mem_mask = 0xff)
{
i8257_device device = m_dma8257.target;
device.write(space, offset, data, mem_mask);
}
public override void execute_run()
{
i8257_device i8257 = (i8257_device)device();
i8257.execute_run();
}