#ifndef NULL_MODEM_H_ #define NULL_MODEM_H_ #include "bus/rs232/rs232.h" #include "imagedev/bitbngr.h" class null_modem_device : public device_t, public device_rs232_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; WRITE_LINE_MEMBER( read ) { output_rxd(state); } /// HACK for DEVCB virtual WRITE_LINE_MEMBER( input_txd ) { if (started()) m_bitbanger->output(state); } protected: virtual void device_start() { output_dcd(0); output_dsr(0); output_cts(0); } virtual void device_reset() { output_rxd(1); } private: required_device m_bitbanger; }; extern const device_type NULL_MODEM; #endif