// license:??? // copyright-holders:??? /********************************************************************** Nintendo Family Computer Yonezawa / PartyRoom 21 Party Tap Controller Copyright MESS Team. Visit http://mamedev.org for licensing and usage restrictions. **********************************************************************/ #include "partytap.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** const device_type NES_PARTYTAP = &device_creator; static INPUT_PORTS_START( nes_partytap ) PORT_START("INPUTS") PORT_BIT( 0x03, IP_ACTIVE_HIGH, IPT_UNUSED ) PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("P1 Button") PORT_CODE(KEYCODE_Z) PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("P2 Button") PORT_CODE(KEYCODE_X) PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("P3 Button") PORT_CODE(KEYCODE_C) PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("P4 Button") PORT_CODE(KEYCODE_V) PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("P5 Button") PORT_CODE(KEYCODE_B) PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("P6 Button") PORT_CODE(KEYCODE_N) INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor nes_partytap_device::device_input_ports() const { return INPUT_PORTS_NAME( nes_partytap ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // nes_partytap_device - constructor //------------------------------------------------- nes_partytap_device::nes_partytap_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, NES_PARTYTAP, "Yonezawa Party Tap Controller", tag, owner, clock, "nes_partytap", __FILE__), device_nes_control_port_interface(mconfig, *this), m_inputs(*this, "INPUTS") { } //------------------------------------------------- // device_start //------------------------------------------------- void nes_partytap_device::device_start() { save_item(NAME(m_latch)); save_item(NAME(m_mode)); } //------------------------------------------------- // device_reset //------------------------------------------------- void nes_partytap_device::device_reset() { m_mode = 0xe0; m_latch = 0; } //------------------------------------------------- // read //------------------------------------------------- UINT8 nes_partytap_device::read_exp(offs_t offset) { UINT8 ret = 0; if (offset == 1) //$4017 { ret |= m_latch & 0x1c; m_latch >>= 3; // append mode bits m_latch |= m_mode; } return ret; } //------------------------------------------------- // write //------------------------------------------------- void nes_partytap_device::write(UINT8 data) { // inputs are read in two chunks of 3 bits, before the second one is read bit2 is written here // probably a mechanism for the game to detect which group of inputs is being read m_mode = BIT(data, 2) ? 0xa0 : 0xe0; if (data & 0x01) return; m_latch = m_inputs->read(); }