#include "driver.h" UINT8 *mexico86_protection_ram; static int kikikai_mcu_running, kikikai_mcu_initialised; /* $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_HANDLER( mexico86_f008_w ) { cpunum_set_input_line(1, INPUT_LINE_RESET, (data & 4) ? CLEAR_LINE : ASSERT_LINE); if (Machine->drv->cpu[2].cpu_type != CPU_DUMMY) { // mexico 86, knight boy cpunum_set_input_line(2, INPUT_LINE_RESET, (data & 2) ? CLEAR_LINE : ASSERT_LINE); } else { // simulation for KiKi KaiKai kikikai_mcu_running = data & 2; if (!kikikai_mcu_running) kikikai_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. ***************************************************************************/ static void mcu_simulate(void) { if (!kikikai_mcu_initialised) { if (mexico86_protection_ram[0x01] == 0x00) { logerror("initialising MCU\n"); mexico86_protection_ram[0x04] = 0xfc; // coin inputs mexico86_protection_ram[0x02] = 0xff; // player 1 mexico86_protection_ram[0x03] = 0xff; // player 2 mexico86_protection_ram[0x1b] = 0xff; // active player mexico86_protection_ram[0x06] = 0xff; // must be FF otherwise PS4 ERROR mexico86_protection_ram[0x07] = 0x03; // must be 03 otherwise PS4 ERROR mexico86_protection_ram[0x00] = 0x00; kikikai_mcu_initialised = 1; } } if (kikikai_mcu_initialised) { int i; static int coin_last; int coin_curr; coin_curr = ~readinputport(0) & 1; if (coin_curr && !coin_last && mexico86_protection_ram[0x01] < 9) { mexico86_protection_ram[0x01]++; // increase credits counter mexico86_protection_ram[0x0a] = 0x01; // set flag (coin inserted sound is not played otherwise) } coin_last = coin_curr; mexico86_protection_ram[0x04] = 0x3c; // coin inputs mexico86_protection_ram[0x02] = BITSWAP8(readinputport(1), 7,6,5,4,2,3,1,0); // player 1 mexico86_protection_ram[0x03] = BITSWAP8(readinputport(2), 7,6,5,4,2,3,1,0); // player 2 if (mexico86_protection_ram[0x19] == 0xaa) // player 2 active mexico86_protection_ram[0x1b] = mexico86_protection_ram[0x03]; else mexico86_protection_ram[0x1b] = mexico86_protection_ram[0x02]; for (i = 0; i < 0x10; i += 2) mexico86_protection_ram[i + 0xb1] = mexico86_protection_ram[i + 0xb0]; for (i = 0; i < 0x0a; i++) mexico86_protection_ram[i + 0xc0] = mexico86_protection_ram[i + 0x90] + 1; if (mexico86_protection_ram[0xd1] == 0xff) { if (mexico86_protection_ram[0xd0] > 0 && mexico86_protection_ram[0xd0] < 4) { mexico86_protection_ram[0xd2] = 0x81; mexico86_protection_ram[0xd0] = 0xff; } } if (mexico86_protection_ram[0xe0] > 0 && mexico86_protection_ram[0xe0] < 4) { static 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 = mexico86_protection_ram[0xe0] - 1; for (i = 1; i < 0x10; i++) mexico86_protection_ram[0xe0 + i] = answers[table][i]; mexico86_protection_ram[0xe0] = 0xff; } if (mexico86_protection_ram[0xf0] > 0 && mexico86_protection_ram[0xf0] < 4) { mexico86_protection_ram[0xf1] = 0xb3; mexico86_protection_ram[0xf0] = 0xff; } // The following is missing from Knight Boy // this should be equivalent to the obfuscated kiki_clogic() below { static int db[16]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,0x10,0x18,0x00,0x00,0x00,0x00}; int sy = mexico86_protection_ram[0xa0] + ((0x18)>>1); int sx = mexico86_protection_ram[0xa1] + ((0x18)>>1); for (i = 0; i < 0x38; i += 8) { int hw = db[mexico86_protection_ram[0x20 + i] & 0xf]; if (hw) { if (abs(sx - (mexico86_protection_ram[0x20 + i+6] * 256 + mexico86_protection_ram[0x20 + i+7])) < hw && abs(sy - (mexico86_protection_ram[0x20 + i+4] * 256 + mexico86_protection_ram[0x20 + i+5])) < hw) mexico86_protection_ram[0xa2] = 1; // we have a collision } } } } } INTERRUPT_GEN( kikikai_interrupt ) { if (kikikai_mcu_running) mcu_simulate(); cpunum_set_input_line_vector(0,0,mexico86_protection_ram[0]); cpunum_set_input_line(0,0,HOLD_LINE); } #if 0 //AT /*************************************************************************** Collision logic used by Kiki Kaikai (theoretical) ***************************************************************************/ #define KIKI_CL_OUT 0xa2 #define KIKI_CL_TRIGGER 0xa3 #define DCWIDTH 0 #define DCHEIGHT 0 static void kiki_clogic(int address, int latch) { static UINT8 db[16]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,0x10,0x18,0x00,0x00,0x00,0x00}; static UINT8 queue[64]; static int qfront = 0, state = 0; int sy, sx, hw, i, qptr, diff1, diff2; if (address != KIKI_CL_TRIGGER) // queue latched data { queue[qfront++] = latch; qfront &= 0x3f; } else if (state ^= 1) // scan queue { sy = queue[(qfront-0x3a)&0x3f] + ((0x18-DCHEIGHT)>>1); sx = queue[(qfront-0x39)&0x3f] + ((0x18-DCWIDTH)>>1); for (i=0x38; i; i-=8) { qptr = qfront - i; if (!(hw = db[queue[qptr&0x3f]&0xf])) continue; diff1 = sx - (short)(queue[(qptr+6)&0x3f]<<8|queue[(qptr+7)&0x3f]) + DCWIDTH; diff2 = diff1 - (hw + DCWIDTH); if ((diff1^diff2)<0) { diff1 = sy - (short)(queue[(qptr+4)&0x3f]<<8|queue[(qptr+5)&0x3f]) + DCHEIGHT; diff2 = diff1 - (hw + DCHEIGHT); if ((diff1^diff2)<0) mexico86_protection_ram[KIKI_CL_OUT] = 1; // we have a collision } } } } //ZT #endif /*************************************************************************** Mexico 86 68705 protection interface The following is ENTIRELY GUESSWORK!!! ***************************************************************************/ INTERRUPT_GEN( mexico86_m68705_interrupt ) { /* I don't know how to handle the interrupt line so I just toggle it every time. */ if (cpu_getiloops() & 1) cpunum_set_input_line(2,0,CLEAR_LINE); else cpunum_set_input_line(2,0,ASSERT_LINE); } static UINT8 portA_in,portA_out,ddrA; READ8_HANDLER( mexico86_68705_portA_r ) { //logerror("%04x: 68705 port A read %02x\n",activecpu_get_pc(),portA_in); return (portA_out & ddrA) | (portA_in & ~ddrA); } WRITE8_HANDLER( mexico86_68705_portA_w ) { //logerror("%04x: 68705 port A write %02x\n",activecpu_get_pc(),data); portA_out = data; } WRITE8_HANDLER( mexico86_68705_ddrA_w ) { ddrA = 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? */ static UINT8 portB_in,portB_out,ddrB; READ8_HANDLER( mexico86_68705_portB_r ) { return (portB_out & ddrB) | (portB_in & ~ddrB); } static int address,latch; WRITE8_HANDLER( mexico86_68705_portB_w ) { //logerror("%04x: 68705 port B write %02x\n",activecpu_get_pc(),data); if ((ddrB & 0x01) && (~data & 0x01) && (portB_out & 0x01)) { portA_in = latch; } if ((ddrB & 0x02) && (data & 0x02) && (~portB_out & 0x02)) /* positive edge trigger */ { address = portA_out; //if (address >= 0x80) logerror("%04x: 68705 address %02x\n",activecpu_get_pc(),portA_out); } if ((ddrB & 0x08) && (~data & 0x08) && (portB_out & 0x08)) { if (data & 0x10) /* read */ { if (data & 0x04) { //logerror("%04x: 68705 read %02x from address %04x\n",activecpu_get_pc(),shared[0x800+address],address); latch = mexico86_protection_ram[address]; } else { //logerror("%04x: 68705 read input port %04x\n",activecpu_get_pc(),address); latch = readinputport((address & 1) + 1); } } else /* write */ { //logerror("%04x: 68705 write %02x to address %04x\n",activecpu_get_pc(),portA_out,address); mexico86_protection_ram[address] = portA_out; } } if ((ddrB & 0x20) && (data & 0x20) && (~portB_out & 0x20)) { cpunum_set_input_line_vector(0,0,mexico86_protection_ram[0]); //cpunum_set_input_line(0,0,PULSE_LINE); cpunum_set_input_line(0, 0, HOLD_LINE); //AT: HOLD_LINE works better in Z80 interrupt mode 1. } if ((ddrB & 0x40) && (~data & 0x40) && (portB_out & 0x40)) { logerror("%04x: 68705 unknown port B bit %02x\n",activecpu_get_pc(),data); } if ((ddrB & 0x80) && (~data & 0x80) && (portB_out & 0x80)) { logerror("%04x: 68705 unknown port B bit %02x\n",activecpu_get_pc(),data); } portB_out = data; } WRITE8_HANDLER( mexico86_68705_ddrB_w ) { ddrB = data; }