diff options
Diffstat (limited to 'src/mess/drivers/alnchase.c')
-rw-r--r-- | src/mess/drivers/alnchase.c | 159 |
1 files changed, 157 insertions, 2 deletions
diff --git a/src/mess/drivers/alnchase.c b/src/mess/drivers/alnchase.c index c09b567691b..430df789198 100644 --- a/src/mess/drivers/alnchase.c +++ b/src/mess/drivers/alnchase.c @@ -5,8 +5,16 @@ Tomy Alien Chase (manufactured in Japan) * boards are labeled TN-16 * NEC uCOM-43 MCU, labeled D553C 258 - * red/green VFD display with color overlay, 2-sided (opposing player sees a mirrored image) + * red/green VFD display with color overlay, 2-sided* + + *Player one views the VFD from the front (grid+filament side) while the + opposite player views it from the back side (through the conductive traces), + basically a mirror-image. + + This is a space-themed tabletop VFD electronic game. To start, simply + press [UP]. Hold a joystick direction to move around. + NOTE!: MESS external artwork is required to be able to play ***************************************************************************/ @@ -23,18 +31,145 @@ public: alnchase_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag), m_maincpu(*this, "maincpu"), + m_button_matrix(*this, "IN"), m_speaker(*this, "speaker") { } required_device<cpu_device> m_maincpu; + required_ioport_array<2> m_button_matrix; required_device<speaker_sound_device> m_speaker; + UINT8 m_input_mux; + UINT32 m_plate; + UINT16 m_grid; + + DECLARE_READ8_MEMBER(input_r); + DECLARE_WRITE8_MEMBER(display_w); + DECLARE_WRITE8_MEMBER(port_e_w); + + UINT32 m_vfd_state[0x10]; + void update_vfd(); + virtual void machine_start(); }; +/*************************************************************************** + + Display + +***************************************************************************/ + +void alnchase_state::update_vfd() +{ + for (int i = 0; i < 9; i++) + if (m_grid & (1 << i) && m_vfd_state[i] != m_plate) + { + // on difference, send to output + for (int j = 0; j < 17; j++) + output_set_lamp_value(i*100 + j, m_plate >> j & 1); + + m_vfd_state[i] = m_plate; + } +} + + + +/*************************************************************************** + + I/O + +***************************************************************************/ + +READ8_MEMBER(alnchase_state::input_r) +{ + UINT8 inp = 0; + + // read selected button rows + for (int i = 0; i < 2; i++) + if (m_input_mux >> i & 1) + inp |= m_button_matrix[i]->read(); + + return inp; +} + +WRITE8_MEMBER(alnchase_state::display_w) +{ + int shift; + + if (offset <= NEC_UCOM4_PORTE) + { + // C/D/E0: vfd matrix grid + shift = (offset - NEC_UCOM4_PORTC) * 4; + m_grid = (m_grid & ~(0xf << shift)) | (data << shift); + + // C0(grid 0): input enable PL1 + // D0(grid 4): input enable PL2 + m_input_mux = (m_grid & 1) | (m_grid >> 3 & 2); + } + + if (offset >= NEC_UCOM4_PORTE) + { + // E23/F/G/H/I: vfd matrix plate + shift = (offset - NEC_UCOM4_PORTE) * 4; + m_plate = ((m_plate << 2 & ~(0xf << shift)) | (data << shift)) >> 2; + } + + update_vfd(); +} + +WRITE8_MEMBER(alnchase_state::port_e_w) +{ + display_w(space, offset, data); + + // E1: speaker out + m_speaker->level_w(data >> 1 & 1); +} + + + +/*************************************************************************** + + Inputs + +***************************************************************************/ + +/* physical button layout and labels is like this: + + POWER SOUND LEVEL PLAYER + ON ON PRO TWO START + o o | | + | | | | [joystick] + | | o o + OFF OFF AMA ONE GAME 0,1,2,3 + + 1 PLAYER SIDE + + other player side only has a joystick +*/ + static INPUT_PORTS_START( alnchase ) + PORT_START("IN.0") // C0 port A + PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) + PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) + PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) + PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) + + PORT_START("IN.1") // D0 port A + PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2) // on non-mirrored view, swap P2 left/right + PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_PLAYER(2) // " + PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_PLAYER(2) + PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_PLAYER(2) + + PORT_START("SW") // port B + PORT_CONFNAME( 0x01, 0x01, "Players" ) + PORT_CONFSETTING( 0x01, "1" ) + PORT_CONFSETTING( 0x00, "2" ) + PORT_CONFNAME( 0x02, 0x00, DEF_STR( Difficulty ) ) + PORT_CONFSETTING( 0x00, "Amateur" ) + PORT_CONFSETTING( 0x02, "Professional" ) + PORT_BIT( 0x0c, IP_ACTIVE_HIGH, IPT_UNUSED ) INPUT_PORTS_END @@ -47,6 +182,17 @@ INPUT_PORTS_END void alnchase_state::machine_start() { + // zerofill + memset(m_vfd_state, 0, sizeof(m_vfd_state)); + m_input_mux = 0; + m_plate = 0; + m_grid = 0; + + // register for savestates + save_item(NAME(m_vfd_state)); + save_item(NAME(m_input_mux)); + save_item(NAME(m_plate)); + save_item(NAME(m_grid)); } @@ -54,6 +200,15 @@ static MACHINE_CONFIG_START( alnchase, alnchase_state ) /* basic machine hardware */ MCFG_CPU_ADD("maincpu", NEC_D553, XTAL_400kHz) + MCFG_UCOM4_READ_A_CB(READ8(alnchase_state, input_r)) + MCFG_UCOM4_READ_B_CB(IOPORT("SW")) + MCFG_UCOM4_WRITE_C_CB(WRITE8(alnchase_state, display_w)) + MCFG_UCOM4_WRITE_D_CB(WRITE8(alnchase_state, display_w)) + MCFG_UCOM4_WRITE_E_CB(WRITE8(alnchase_state, port_e_w)) + MCFG_UCOM4_WRITE_F_CB(WRITE8(alnchase_state, display_w)) + MCFG_UCOM4_WRITE_G_CB(WRITE8(alnchase_state, display_w)) + MCFG_UCOM4_WRITE_H_CB(WRITE8(alnchase_state, display_w)) + MCFG_UCOM4_WRITE_I_CB(WRITE8(alnchase_state, display_w)) MCFG_DEFAULT_LAYOUT(layout_alnchase) @@ -79,4 +234,4 @@ ROM_START( alnchase ) ROM_END -CONS( 1984, alnchase, 0, 0, alnchase, alnchase, driver_device, 0, "Tomy", "Alien Chase", GAME_NOT_WORKING | GAME_SUPPORTS_SAVE ) +CONS( 1984, alnchase, 0, 0, alnchase, alnchase, driver_device, 0, "Tomy", "Alien Chase", GAME_NOT_WORKING ) |