diff options
Diffstat (limited to 'src/mess/drivers/simon.c')
-rw-r--r-- | src/mess/drivers/simon.c | 49 |
1 files changed, 29 insertions, 20 deletions
diff --git a/src/mess/drivers/simon.c b/src/mess/drivers/simon.c index 690c55658f1..31935390c9f 100644 --- a/src/mess/drivers/simon.c +++ b/src/mess/drivers/simon.c @@ -5,7 +5,7 @@ Milton Bradley Simon Revision A hardware: - * TMS1000 (has internal ROM), SN75494 lamp driver + * TMS1000 (has internal ROM), DS75494 lamp driver Newer revisions have a smaller 16-pin MB4850 chip instead of the TMS1000. This one has been decapped too, but we couldn't yet find the internal ROM. @@ -13,11 +13,6 @@ Other games assumed to be on similar hardware: - Pocket Simon - Super Simon - - - TODO: - - accurate rc osc - - where's the skill switch? ***************************************************************************/ @@ -27,9 +22,9 @@ #include "simon.lh" -// master clock is a single stage RC oscillator: R=?, C=? -// this is an approximation compared with old recordings -#define SIMON_RC_CLOCK (330000) +// master clock is a single stage RC oscillator: R=33K, C=100pf, +// according to the TMS 1000 series data manual this is around 350kHz +#define SIMON_RC_CLOCK (350000) class simon_state : public driver_device @@ -38,12 +33,12 @@ public: simon_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag), m_maincpu(*this, "maincpu"), - m_button_matrix(*this, "R"), + m_button_matrix(*this, "IN"), m_speaker(*this, "speaker") { } required_device<cpu_device> m_maincpu; - required_ioport_array<3> m_button_matrix; + required_ioport_array<4> m_button_matrix; required_device<speaker_sound_device> m_speaker; UINT16 m_r; @@ -67,23 +62,30 @@ READ8_MEMBER(simon_state::read_k) UINT8 k = 0; // read selected button rows - for (int i = 0; i < 3; i++) - if (m_r & (1 << i)) + for (int i = 0; i < 4; i++) + { + static int r[4] = { 0, 1, 2, 9 }; + if (m_r & (1 << r[i])) k |= m_button_matrix[i]->read(); + } return k; } WRITE16_MEMBER(simon_state::write_r) { - // R4-R7: lamps, through 75494 IC + // R4-R8 go through an 75494 IC first: + // R4 -> 75494 IN6 -> green lamp + // R5 -> 75494 IN3 -> red lamp + // R6 -> 75494 IN5 -> yellow lamp + // R7 -> 75494 IN2 -> blue lamp for (int i = 0; i < 4; i++) output_set_lamp_value(i, data >> (4 + i) & 1); - // R8: speaker + // R8 -> 75494 IN0 -> speaker m_speaker->level_w(data >> 8 & 1); - // R0-R2: input mux + // R0,R1,R2,R9: input mux // R3: GND // other bits: N/C m_r = data; @@ -103,24 +105,31 @@ WRITE16_MEMBER(simon_state::write_o) ***************************************************************************/ static INPUT_PORTS_START( simon ) - PORT_START("R.0") + PORT_START("IN.0") PORT_CONFNAME( 0x07, 0x02, "Game Select") PORT_CONFSETTING( 0x02, "1" ) PORT_CONFSETTING( 0x01, "2" ) PORT_CONFSETTING( 0x04, "3" ) PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNUSED ) - PORT_START("R.1") + PORT_START("IN.1") PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON5 ) PORT_NAME("Green Button") PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON6 ) PORT_NAME("Red Button") PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON7 ) PORT_NAME("Yellow Button") PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_BUTTON8 ) PORT_NAME("Blue Button") - PORT_START("R.2") + PORT_START("IN.2") PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_START ) PORT_NAME("Start") PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("Last") PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Longest") PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNUSED ) + + PORT_START("IN.3") + PORT_CONFNAME( 0x0f, 0x01, "Skill Level") + PORT_CONFSETTING( 0x02, "1" ) + PORT_CONFSETTING( 0x04, "2" ) + PORT_CONFSETTING( 0x08, "3" ) + PORT_CONFSETTING( 0x01, "4" ) INPUT_PORTS_END @@ -177,7 +186,7 @@ MACHINE_CONFIG_END ROM_START( simon ) ROM_REGION( 0x0800, "maincpu", ROMREGION_ERASE00 ) - ROM_LOAD( "simon.bin", 0x0000, 0x0400, CRC(9961719d) SHA1(35dddb018a8a2b31f377ab49c1f0cb76951b81c0) ) + ROM_LOAD( "tms1000.u1", 0x0000, 0x0400, CRC(9961719d) SHA1(35dddb018a8a2b31f377ab49c1f0cb76951b81c0) ) ROM_END |