#ifndef NULL_MODEM_H_ #define NULL_MODEM_H_ #include "emu.h" #include "machine/serial.h" #include "imagedev/bitbngr.h" class null_modem_device : public device_t, public device_serial_port_interface { public: null_modem_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); virtual machine_config_constructor device_mconfig_additions() const; DECLARE_WRITE_LINE_MEMBER( read ) { m_rbit = state; m_owner->out_rx(state); } virtual void tx(UINT8 state) { m_tbit = state; m_bitbanger->output(state); } protected: virtual void device_start() { m_owner = dynamic_cast(owner()); } virtual void device_reset() { m_owner->out_rx(1); m_rbit = 1; } private: serial_port_device *m_owner; required_device m_bitbanger; }; extern const device_type NULL_MODEM; #endif