// license:BSD-3-Clause // copyright-holders:Ernesto Corvi #include "emu.h" #include "includes/mexico86.h" /* $f008 - write bit 7 = ? (unused?) bit 6 = ? (unused?) bit 5 = ? (unused?) bit 4 = ? (usually set in game) bit 3 = ? (usually set in game) bit 2 = sound cpu reset line bit 1 = microcontroller reset line bit 0 = ? (unused?) */ WRITE8_MEMBER(mexico86_state::mexico86_f008_w) { m_audiocpu->set_input_line(INPUT_LINE_RESET, (data & 4) ? CLEAR_LINE : ASSERT_LINE); if (m_mcu != nullptr) { // mexico 86, knight boy m_mcu->set_input_line(INPUT_LINE_RESET, (data & 2) ? CLEAR_LINE : ASSERT_LINE); } else { // simulation for KiKi KaiKai m_mcu_running = data & 2; if (!m_mcu_running) m_mcu_initialised = 0; } } /*************************************************************************** KiKi KaiKai MCU simulation This is derived from examination of the bootleg 68705 MCU code, with an addition to fix collision detection which is missing from the bootleg. ***************************************************************************/ void mexico86_state::mcu_simulate( ) { if (!m_mcu_initialised) { if (m_protection_ram[0x01] == 0x00) { logerror("initialising MCU\n"); m_protection_ram[0x04] = 0xfc; // coin inputs m_protection_ram[0x02] = 0xff; // player 1 m_protection_ram[0x03] = 0xff; // player 2 m_protection_ram[0x1b] = 0xff; // active player m_protection_ram[0x06] = 0xff; // must be FF otherwise PS4 ERROR m_protection_ram[0x07] = 0x03; // must be 03 otherwise PS4 ERROR m_protection_ram[0x00] = 0x00; m_mcu_initialised = 1; } } if (m_mcu_initialised) { int i; int coin_curr; coin_curr = ~ioport("IN0")->read() & 1; if (coin_curr && !m_coin_last && m_protection_ram[0x01] < 9) { m_protection_ram[0x01]++; // increase credits counter m_protection_ram[0x0a] = 0x01; // set flag (coin inserted sound is not played otherwise) } m_coin_last = coin_curr; m_protection_ram[0x04] = 0x3c; // coin inputs m_protection_ram[0x02] = BITSWAP8(ioport("IN1")->read(), 7,6,5,4,2,3,1,0); // player 1 m_protection_ram[0x03] = BITSWAP8(ioport("IN2")->read(), 7,6,5,4,2,3,1,0); // player 2 if (m_protection_ram[0x19] == 0xaa) // player 2 active m_protection_ram[0x1b] = m_protection_ram[0x03]; else m_protection_ram[0x1b] = m_protection_ram[0x02]; for (i = 0; i < 0x10; i += 2) m_protection_ram[i + 0xb1] = m_protection_ram[i + 0xb0]; for (i = 0; i < 0x0a; i++) m_protection_ram[i + 0xc0] = m_protection_ram[i + 0x90] + 1; if (m_protection_ram[0xd1] == 0xff) { if (m_protection_ram[0xd0] > 0 && m_protection_ram[0xd0] < 4) { m_protection_ram[0xd2] = 0x81; m_protection_ram[0xd0] = 0xff; } } if (m_protection_ram[0xe0] > 0 && m_protection_ram[0xe0] < 4) { static const UINT8 answers[3][16] = { { 0x00,0x40,0x48,0x50,0x58,0x60,0x68,0x70,0x78,0x80,0x88,0x00,0x00,0x00,0x00,0x00 }, { 0x00,0x04,0x08,0x0C,0x10,0x14,0x18,0x1C,0x20,0x31,0x2B,0x35,0x00,0x00,0x00,0x00 }, { 0x00,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,0x03,0x0A,0x0B,0x14,0x00,0x00,0x00,0x00 }, }; int table = m_protection_ram[0xe0] - 1; for (i = 1; i < 0x10; i++) m_protection_ram[0xe0 + i] = answers[table][i]; m_protection_ram[0xe0] = 0xff; } if (m_protection_ram[0xf0] > 0 && m_protection_ram[0xf0] < 4) { m_protection_ram[0xf1] = 0xb3; m_protection_ram[0xf0] = 0xff; } // The following is missing from Knight Boy // this should be equivalent to the obfuscated kiki_clogic() below { static const UINT8 db[16]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,0x10,0x18,0x00,0x00,0x00,0x00}; UINT16 sy = m_protection_ram[0xa0] + ((0x18) >> 1); UINT16 sx = m_protection_ram[0xa1] + ((0x18) >> 1); for (i = 0; i < 0x38; i += 8) { UINT8 hw = db[m_protection_ram[0x20 + i] & 0xf]; if (hw) { UINT16 xdiff = sx - ((UINT16)m_protection_ram[0x20 + i + 6] << 8 | m_protection_ram[0x20 + i + 7]); if (xdiff < hw) { UINT16 ydiff = sy - ((UINT16)m_protection_ram[0x20 + i + 4] << 8 | m_protection_ram[0x20 + i + 5]); if (ydiff < hw) m_protection_ram[0xa2] = 1; // we have a collision } } } } } } INTERRUPT_GEN_MEMBER(mexico86_state::kikikai_interrupt) { if (m_mcu_running) mcu_simulate(); device.execute().set_input_line_vector(0, m_protection_ram[0]); device.execute().set_input_line(0, HOLD_LINE); } #if 0 /*************************************************************************** Collision logic used by Kiki Kaikai (theoretical) ***************************************************************************/ #define KIKI_CL_OUT 0xa2 #define KIKI_CL_TRIGGER 0xa3 #define DCWIDTH 0 #define DCHEIGHT 0 void mexico86_state::kiki_clogic(int address, int latch) { static const UINT8 db[16]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,0x10,0x18,0x00,0x00,0x00,0x00}; int sy, sx, hw, i, qptr, diff1, diff2; if (address != KIKI_CL_TRIGGER) // m_queue latched data { m_queue[m_qfront++] = latch; m_qfront &= 0x3f; } else if (m_qstate ^= 1) // scan m_queue { sy = m_queue[(m_qfront-0x3a)&0x3f] + ((0x18-DCHEIGHT)>>1); sx = m_queue[(m_qfront-0x39)&0x3f] + ((0x18-DCWIDTH)>>1); for (i=0x38; i; i-=8) { qptr = m_qfront - i; if (!(hw = db[m_queue[qptr&0x3f]&0xf])) continue; diff1 = sx - (short)(m_queue[(qptr+6)&0x3f]<<8|m_queue[(qptr+7)&0x3f]) + DCWIDTH; diff2 = diff1 - (hw + DCWIDTH); if ((diff1^diff2)<0) { diff1 = sy - (short)(m_queue[(qptr+4)&0x3f]<<8|m_queue[(qptr+5)&0x3f]) + DCHEIGHT; diff2 = diff1 - (hw + DCHEIGHT); if ((diff1^diff2)<0) m_protection_ram[KIKI_CL_OUT] = 1; // we have a collision } } } } #endif /*************************************************************************** Mexico 86 68705 protection interface The following is ENTIRELY GUESSWORK!!! ***************************************************************************/ INTERRUPT_GEN_MEMBER(mexico86_state::mexico86_m68705_interrupt) { device.execute().set_input_line(0, ASSERT_LINE); } READ8_MEMBER(mexico86_state::mexico86_68705_port_a_r) { //logerror("%04x: 68705 port A read %02x\n", space.device().safe_pc(), m_port_a_in); return (m_port_a_out & m_ddr_a) | (m_port_a_in & ~m_ddr_a); } WRITE8_MEMBER(mexico86_state::mexico86_68705_port_a_w) { //logerror("%04x: 68705 port A write %02x\n", space.device().safe_pc(), data); m_port_a_out = data; } WRITE8_MEMBER(mexico86_state::mexico86_68705_ddr_a_w) { m_ddr_a = data; } /* * Port B connections: * * all bits are logical 1 when read (+5V pullup) * * 0 W enables latch which holds data from main Z80 memory * 1 W loads the latch which holds the low 8 bits of the address of * the main Z80 memory location to access * 2 W 0 = read input ports, 1 = access Z80 memory * 3 W clocks main Z80 memory access * 4 W selects Z80 memory access direction (0 = write 1 = read) * 5 W clocks a flip-flop which causes IRQ on the main Z80 * 6 W not used? * 7 W not used? */ READ8_MEMBER(mexico86_state::mexico86_68705_port_b_r) { return (m_port_b_out & m_ddr_b) | (m_port_b_in & ~m_ddr_b); } WRITE8_MEMBER(mexico86_state::mexico86_68705_port_b_w) { //logerror("%04x: 68705 port B write %02x\n", space.device().safe_pc(), data); if (BIT(m_ddr_b, 0) && BIT(~data, 0) && BIT(m_port_b_out, 0)) { m_port_a_in = m_latch; } if (BIT(m_ddr_b, 1) && BIT(data, 1) && BIT(~m_port_b_out, 1)) /* positive edge trigger */ { m_address = m_port_a_out; //if (m_address >= 0x80) logerror("%04x: 68705 address %02x\n", space.device().safe_pc(), m_port_a_out); } if (BIT(m_ddr_b, 3) && BIT(~data, 3) && BIT(m_port_b_out, 3)) { if (data & 0x10) /* read */ { if (data & 0x04) { //logerror("%04x: 68705 read %02x from address %04x\n", space.device().safe_pc(), m_protection_ram[m_address], m_address); m_latch = m_protection_ram[m_address]; } else { //logerror("%04x: 68705 read input port %04x\n", space.device().safe_pc(), m_address); m_latch = ioport((m_address & 1) ? "IN2" : "IN1")->read(); } } else /* write */ { //logerror("%04x: 68705 write %02x to address %04x\n",space.device().safe_pc(), port_a_out, m_address); m_protection_ram[m_address] = m_port_a_out; } } if (BIT(m_ddr_b, 5) && BIT(data, 5) && BIT(~m_port_b_out, 5)) { m_maincpu->set_input_line_vector(0, m_protection_ram[0]); m_maincpu->set_input_line(0, HOLD_LINE); // HOLD_LINE works better in Z80 interrupt mode 1. m_mcu->set_input_line(0, CLEAR_LINE); } if (BIT(m_ddr_b, 6) && BIT(~data, 6) && BIT(m_port_b_out, 6)) { logerror("%04x: 68705 unknown port B bit %02x\n", space.device().safe_pc(), data); } if (BIT(m_ddr_b, 7) && BIT(~data, 7) && BIT(m_port_b_out, 7)) { logerror("%04x: 68705 unknown port B bit %02x\n", space.device().safe_pc(), data); } m_port_b_out = data; } WRITE8_MEMBER(mexico86_state::mexico86_68705_ddr_b_w) { m_ddr_b = data; }