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-rw-r--r--src/mess/drivers/splitsec.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/src/mess/drivers/splitsec.c b/src/mess/drivers/splitsec.c
new file mode 100644
index 00000000000..30ed07f08cf
--- /dev/null
+++ b/src/mess/drivers/splitsec.c
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+// license:BSD-3-Clause
+// copyright-holders:hap
+/***************************************************************************
+
+ Parker Brothers Split Second
+ * TMS1400NLL MP7314-N2 (die labeled MP7314)
+
+
+***************************************************************************/
+
+#include "emu.h"
+#include "cpu/tms0980/tms0980.h"
+#include "sound/speaker.h"
+
+#include "splitsec.lh"
+
+// master clock is a single stage RC oscillator: R=24K, C=100pf,
+// according to the TMS 1000 series data manual this is around 375kHz
+#define MASTER_CLOCK (375000)
+
+
+class splitsec_state : public driver_device
+{
+public:
+ splitsec_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;
+
+ UINT16 m_r;
+ UINT16 m_o;
+
+ UINT16 m_leds_state[0x10];
+ UINT16 m_leds_cache[0x10];
+ UINT8 m_leds_decay[0x100];
+
+ DECLARE_READ8_MEMBER(read_k);
+ DECLARE_WRITE16_MEMBER(write_o);
+ DECLARE_WRITE16_MEMBER(write_r);
+
+ TIMER_DEVICE_CALLBACK_MEMBER(leds_decay_tick);
+ void leds_update();
+
+ virtual void machine_start();
+};
+
+
+
+/***************************************************************************
+
+ LEDs
+
+***************************************************************************/
+
+// The device strobes the outputs very fast, it is unnoticeable to the user.
+// To prevent flickering here, we need to simulate a decay.
+
+// decay time, in steps of 10ms
+#define LEDS_DECAY_TIME 4
+
+void splitsec_state::leds_update()
+{
+ UINT16 active_state[0x10];
+
+ for (int i = 0; i < 0x10; i++)
+ {
+ // update current state
+ if (m_r >> i & 1)
+ m_leds_state[i] = m_o;
+
+ active_state[i] = 0;
+
+ for (int j = 0; j < 0x10; j++)
+ {
+ int di = j << 4 | i;
+
+ // turn on powered leds
+ if (m_leds_state[i] >> j & 1)
+ m_leds_decay[di] = LEDS_DECAY_TIME;
+
+ // determine active state
+ int ds = (m_leds_decay[di] != 0) ? 1 : 0;
+ active_state[i] |= (ds << j);
+ }
+ }
+
+ // on difference, send to output
+ for (int i = 0; i < 0x10; i++)
+ if (m_leds_cache[i] != active_state[i])
+ {
+ for (int j = 0; j < 8; j++)
+ output_set_lamp_value(i*10 + j, active_state[i] >> j & 1);
+ }
+
+ memcpy(m_leds_cache, active_state, sizeof(m_leds_cache));
+}
+
+TIMER_DEVICE_CALLBACK_MEMBER(splitsec_state::leds_decay_tick)
+{
+ // slowly turn off unpowered leds
+ for (int i = 0; i < 0x100; i++)
+ if (!(m_leds_state[i & 0xf] >> (i>>4) & 1) && m_leds_decay[i])
+ m_leds_decay[i]--;
+
+ leds_update();
+}
+
+
+
+/***************************************************************************
+
+ I/O
+
+***************************************************************************/
+
+READ8_MEMBER(splitsec_state::read_k)
+{
+ UINT8 k = 0;
+
+ // read selected button rows
+ for (int i = 0; i < 2; i++)
+ if (m_r >> (i+9) & 1)
+ k |= m_button_matrix[i]->read();
+
+ return k;
+}
+
+WRITE16_MEMBER(splitsec_state::write_r)
+{
+ // R8: speaker out
+ m_speaker->level_w(data >> 8 & 1);
+
+ // R9,R10: input mux
+ // R0-R7: led columns
+ m_r = data;
+ leds_update();
+}
+
+WRITE16_MEMBER(splitsec_state::write_o)
+{
+ // O0-O6: led rows
+ // O7: N/C
+ m_o = data;
+ leds_update();
+}
+
+
+
+/***************************************************************************
+
+ Inputs
+
+***************************************************************************/
+
+static INPUT_PORTS_START( splitsec )
+ PORT_START("IN.0") // R9
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT )
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP )
+ PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT )
+ PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+ PORT_START("IN.1") // R10
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN )
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("Select")
+ PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Start")
+ PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNUSED )
+INPUT_PORTS_END
+
+
+
+/***************************************************************************
+
+ Machine Config
+
+***************************************************************************/
+
+void splitsec_state::machine_start()
+{
+ // zerofill
+ memset(m_leds_state, 0, sizeof(m_leds_state));
+ memset(m_leds_cache, 0, sizeof(m_leds_cache));
+ memset(m_leds_decay, 0, sizeof(m_leds_decay));
+
+ m_r = 0;
+ m_o = 0;
+
+ // register for savestates
+ save_item(NAME(m_leds_state));
+ save_item(NAME(m_leds_cache));
+ save_item(NAME(m_leds_decay));
+
+ save_item(NAME(m_r));
+ save_item(NAME(m_o));
+}
+
+
+static MACHINE_CONFIG_START( splitsec, splitsec_state )
+
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu", TMS1400, MASTER_CLOCK)
+ MCFG_TMS1XXX_READ_K_CB(READ8(splitsec_state, read_k))
+ MCFG_TMS1XXX_WRITE_O_CB(WRITE16(splitsec_state, write_o))
+ MCFG_TMS1XXX_WRITE_R_CB(WRITE16(splitsec_state, write_r))
+
+ MCFG_TIMER_DRIVER_ADD_PERIODIC("leds_decay", splitsec_state, leds_decay_tick, attotime::from_msec(10))
+
+ MCFG_DEFAULT_LAYOUT(layout_splitsec)
+
+ /* no video! */
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
+MACHINE_CONFIG_END
+
+
+
+/***************************************************************************
+
+ Game driver(s)
+
+***************************************************************************/
+
+ROM_START( splitsec )
+ ROM_REGION( 0x1000, "maincpu", 0 )
+ ROM_LOAD( "tms1400nll_mp7314", 0x0000, 0x1000, CRC(0cccdf59) SHA1(06a533134a433aaf856b80f0ca239d0498b98d5f) )
+
+ ROM_REGION( 867, "maincpu:mpla", 0 )
+ ROM_LOAD( "tms1100_default_mpla.pla", 0, 867, CRC(62445fc9) SHA1(d6297f2a4bc7a870b76cc498d19dbb0ce7d69fec) )
+ ROM_REGION( 557, "maincpu:opla", 0 )
+ ROM_LOAD( "tms1400_splitsec_opla.pla", 0, 557, CRC(7539283b) SHA1(f791fa98259fc10c393ff1961d4c93040f1a2932) )
+ROM_END
+
+
+CONS( 1980, splitsec, 0, 0, splitsec, splitsec, driver_device, 0, "Parker Brothers", "Split Second", GAME_SUPPORTS_SAVE | GAME_NOT_WORKING )